/*
 * jQuery form plugin
 * @requires jQuery v1.1 or later
 *
 * Examples at: http://malsup.com/jquery/form/
 * Dual licensed under the MIT and GPL licenses:
 *   http://www.opensource.org/licenses/mit-license.php
 *   http://www.gnu.org/licenses/gpl.html
 *
 * Revision: $Id: jquery_form.js,v 1.1.1.1 2010/01/28 14:52:30 mallinger Exp $
 * Version: 1.0.1  Jul-07-2007
 */
(function($) {
	/**
	 * ajaxSubmit() provides a mechanism for submitting an HTML form using AJAX.
	 *
	 * ajaxSubmit accepts a single argument which can be either a success callback function
	 * or an options Object.  If a function is provided it will be invoked upon successful
	 * completion of the submit and will be passed the response from the server.
	 * If an options Object is provided, the following attributes are supported:
	 *
	 *  target:   Identifies the element(s) in the page to be updated with the server response.
	 *            This value may be specified as a jQuery selection string, a jQuery object,
	 *            or a DOM element.
	 *            default value: null
	 *
	 *  url:      URL to which the form data will be submitted.
	 *            default value: value of form's 'action' attribute
	 *
	 *  type:     The method in which the form data should be submitted, 'GET' or 'POST'.
	 *            default value: value of form's 'method' attribute (or 'GET' if none found)
	 *
	 *  beforeSubmit:  Callback method to be invoked before the form is submitted.
	 *            default value: null
	 *
	 *  success:  Callback method to be invoked after the form has been successfully submitted
	 *            and the response has been returned from the server
	 *            default value: null
	 *
	 *  dataType: Expected dataType of the response.  One of: null, 'xml', 'script', or 'json'
	 *            default value: null
	 *
	 *  semantic: Boolean flag indicating whether data must be submitted in semantic order (slower).
	 *            default value: false
	 *
	 *  resetForm: Boolean flag indicating whether the form should be reset if the submit is successful
	 *
	 *  clearForm: Boolean flag indicating whether the form should be cleared if the submit is successful
	 *
	 *
	 * The 'beforeSubmit' callback can be provided as a hook for running pre-submit logic or for
	 * validating the form data.  If the 'beforeSubmit' callback returns false then the form will
	 * not be submitted. The 'beforeSubmit' callback is invoked with three arguments: the form data
	 * in array format, the jQuery object, and the options object passed into ajaxSubmit.
	 * The form data array takes the following form:
	 *
	 *     [ { name: 'username', value: 'jresig' }, { name: 'password', value: 'secret' } ]
	 *
	 * If a 'success' callback method is provided it is invoked after the response has been returned
	 * from the server.  It is passed the responseText or responseXML value (depending on dataType).
	 * See jQuery.ajax for further details.
	 *
	 *
	 * The dataType option provides a means for specifying how the server response should be handled.
	 * This maps directly to the jQuery.httpData method.  The following values are supported:
	 *
	 *      'xml':    if dataType == 'xml' the server response is treated as XML and the 'after'
	 *                   callback method, if specified, will be passed the responseXML value
	 *      'json':   if dataType == 'json' the server response will be evaluted and passed to
	 *                   the 'after' callback, if specified
	 *      'script': if dataType == 'script' the server response is evaluated in the global context
	 *
	 *
	 * Note that it does not make sense to use both the 'target' and 'dataType' options.  If both
	 * are provided the target will be ignored.
	 *
	 * The semantic argument can be used to force form serialization in semantic order.
	 * This is normally true anyway, unless the form contains input elements of type='image'.
	 * If your form must be submitted with name/value pairs in semantic order and your form
	 * contains an input of type='image" then pass true for this arg, otherwise pass false
	 * (or nothing) to avoid the overhead for this logic.
	 *
	 *
	 * When used on its own, ajaxSubmit() is typically bound to a form's submit event like this:
	 *
	 * $("#form-id").submit(function() {
	 *     $(this).ajaxSubmit(options);
	 *     return false; // cancel conventional submit
	 * });
	 *
	 * When using ajaxForm(), however, this is done for you.
	 *
	 * @example
	 * $('#myForm').ajaxSubmit(function(data) {
	 *     alert('Form submit succeeded! Server returned: ' + data);
	 * });
	 * @desc Submit form and alert server response
	 *
	 *
	 * @example
	 * var options = {
	 *     target: '#myTargetDiv'
	 * };
	 * $('#myForm').ajaxSubmit(options);
	 * @desc Submit form and update page element with server response
	 *
	 *
	 * @example
	 * var options = {
	 *     success: function(responseText) {
	 *         alert(responseText);
	 *     }
	 * };
	 * $('#myForm').ajaxSubmit(options);
	 * @desc Submit form and alert the server response
	 *
	 *
	 * @example
	 * var options = {
	 *     beforeSubmit: function(formArray, jqForm) {
	 *         if (formArray.length == 0) {
	 *             alert('Please enter data.');
	 *             return false;
	 *         }
	 *     }
	 * };
	 * $('#myForm').ajaxSubmit(options);
	 * @desc Pre-submit validation which aborts the submit operation if form data is empty
	 *
	 *
	 * @example
	 * var options = {
	 *     url: myJsonUrl.php,
	 *     dataType: 'json',
	 *     success: function(data) {
	 *        // 'data' is an object representing the the evaluated json data
	 *     }
	 * };
	 * $('#myForm').ajaxSubmit(options);
	 * @desc json data returned and evaluated
	 *
	 *
	 * @example
	 * var options = {
	 *     url: myXmlUrl.php,
	 *     dataType: 'xml',
	 *     success: function(responseXML) {
	 *        // responseXML is XML document object
	 *        var data = $('myElement', responseXML).text();
	 *     }
	 * };
	 * $('#myForm').ajaxSubmit(options);
	 * @desc XML data returned from server
	 *
	 *
	 * @example
	 * var options = {
	 *     resetForm: true
	 * };
	 * $('#myForm').ajaxSubmit(options);
	 * @desc submit form and reset it if successful
	 *
	 * @example
	 * $('#myForm).submit(function() {
	 *    $(this).ajaxSubmit();
	 *    return false;
	 * });
	 * @desc Bind form's submit event to use ajaxSubmit
	 *
	 *
	 * @name ajaxSubmit
	 * @type jQuery
	 * @param options  object literal containing options which control the form submission process
	 * @cat Plugins/Form
	 * @return jQuery
	 */
	$.fn.ajaxSubmit = function(options) {
		if (typeof options == 'function')
			options = { success: options };

		options = $.extend({
			url:  this.attr('action') || window.location,
			type: this.attr('method') || 'GET'
		}, options || {});

		var a = this.formToArray(options.semantic);

		// give pre-submit callback an opportunity to abort the submit
		if (options.beforeSubmit && options.beforeSubmit(a, this, options) === false) return this;

		// fire vetoable 'validate' event
		var veto = {};
		$.event.trigger('form.submit.validate', [a, this, options, veto]);
		if (veto.veto)
			return this;

		var q = $.param(a);
		//.replace(/%20/g,'+');

		if (options.type.toUpperCase() == 'GET') {
			options.url += (options.url.indexOf('?') >= 0 ? '&' : '?') + q;
			options.data = null;
			// data is null for 'get'
		}
		else
			options.data = q;
		// data is the query string for 'post'

		var $form = this, callbacks = [];
		if (options.resetForm) callbacks.push(function() {
			$form.resetForm();
		});
		if (options.clearForm) callbacks.push(function() {
			$form.clearForm();
		});

		// perform a load on the target only if dataType is not provided
		if (!options.dataType && options.target) {
			var oldSuccess = options.success;
			// || function(){};
			callbacks.push(function(data, status) {
				$(options.target).attr("innerHTML", data).evalScripts().each(oldSuccess, [data, status]);
			});
		}
		else if (options.success)
			callbacks.push(options.success);

		options.success = function(data, status) {
			for (var i = 0, max = callbacks.length; i < max; i++)
				callbacks[i](data, status);
		};

		// are there files to upload?
		var files = $('input:file', this).fieldValue();
		var found = false;
		for (var j = 0; j < files.length; j++)
			if (files[j])
				found = true;

		if (options.iframe || found) // options.iframe allows user to force iframe mode
			fileUpload();
		else
			$.ajax(options);

		// fire 'notify' event
		$.event.trigger('form.submit.notify', [this, options]);
		return this;


		// private function for handling file uploads (hat tip to YAHOO!)
		function fileUpload() {
			var form = $form[0];
			var opts = $.extend({}, $.ajaxSettings, options);

			var id = 'jqFormIO' + $.fn.ajaxSubmit.counter++;
			var $io = $('<iframe id="' + id + '" name="' + id + '" />');
			var io = $io[0];
			var op8 = $.browser.opera && window.opera.version() < 9;
			if ($.browser.msie || op8) io.src = 'javascript:false;document.write("");';
			$io.css({ position: 'absolute', top: '-1000px', left: '-1000px' });

			var xhr = { // mock object
				responseText: null,
				responseXML: null,
				status: 0,
				statusText: 'n/a',
				getAllResponseHeaders: function() {
				},
				getResponseHeader: function() {
				},
				setRequestHeader: function() {
				}
			};

			var g = opts.global;
			// trigger ajax global events so that activity/block indicators work like normal
			if (g && ! $.active++) $.event.trigger("ajaxStart");
			if (g) $.event.trigger("ajaxSend", [xhr, opts]);

			var cbInvoked = 0;
			var timedOut = 0;

			// take a breath so that pending repaints get some cpu time before the upload starts
			setTimeout(function() {
				$io.appendTo('body');
				// jQuery's event binding doesn't work for iframe events in IE
				io.attachEvent ? io.attachEvent('onload', cb) : io.addEventListener('load', cb, false);

				// make sure form attrs are set
				var encAttr = form.encoding ? 'encoding' : 'enctype';
				var t = $form.attr('target');
				$form.attr({
					target:   id,
					method:  'POST',
					encAttr: 'multipart/form-data',
					action:   opts.url
				});

				// support timout
				if (opts.timeout)
					setTimeout(function() {
						timedOut = true;
						cb();
					}, opts.timeout);

				form.submit();
				$form.attr('target', t);
				// reset target
			}, 10);

			function cb() {
				if (cbInvoked++) return;

				io.detachEvent ? io.detachEvent('onload', cb) : io.removeEventListener('load', cb, false);

				var ok = true;
				try {
					if (timedOut) throw 'timeout';
					// extract the server response from the iframe
					var data, doc;
					doc = io.contentWindow ? io.contentWindow.document : io.contentDocument ? io.contentDocument : io.document;
					xhr.responseText = doc.body ? doc.body.innerHTML : null;
					xhr.responseXML = doc.XMLDocument ? doc.XMLDocument : doc;

					if (opts.dataType == 'json' || opts.dataType == 'script') {
						var ta = doc.getElementsByTagName('textarea')[0];
						data = ta ? ta.value : xhr.responseText;
						if (opts.dataType == 'json')
							eval("data = " + data);
						else
							$.globalEval(data);
					}
					else if (opts.dataType == 'xml') {
						data = xhr.responseXML;
						if (!data && xhr.responseText != null)
							data = toXml(xhr.responseText);
					}
					else {
						data = xhr.responseText;
					}
				}
				catch(e) {
					ok = false;
					$.handleError(opts, xhr, 'error', e);
				}

				// ordering of these callbacks/triggers is odd, but that's how $.ajax does it
				if (ok) {
					opts.success(data, 'success');
					if (g) $.event.trigger("ajaxSuccess", [xhr, opts]);
				}
				if (g) $.event.trigger("ajaxComplete", [xhr, opts]);
				if (g && ! --$.active) $.event.trigger("ajaxStop");
				if (opts.complete) opts.complete(xhr, ok ? 'success' : 'error');

				// clean up
				setTimeout(function() {
					$io.remove();
					xhr.responseXML = null;
				}, 100);
			}
			;

			function toXml(s, doc) {
				if (window.ActiveXObject) {
					doc = new ActiveXObject('Microsoft.XMLDOM');
					doc.async = 'false';
					doc.loadXML(s);
				}
				else
					doc = (new DOMParser()).parseFromString(s, 'text/xml');
				return (doc && doc.documentElement && doc.documentElement.tagName != 'parsererror') ? doc : null;
			}
			;
		}
		;
	};
	$.fn.ajaxSubmit.counter = 0;
	// used to create unique iframe ids

	/**
	 * ajaxForm() provides a mechanism for fully automating form submission.
	 *
	 * The advantages of using this method instead of ajaxSubmit() are:
	 *
	 * 1: This method will include coordinates for <input type="image" /> elements (if the element
	 *    is used to submit the form).
	 * 2. This method will include the submit element's name/value data (for the element that was
	 *    used to submit the form).
	 * 3. This method binds the submit() method to the form for you.
	 *
	 * Note that for accurate x/y coordinates of image submit elements in all browsers
	 * you need to also use the "dimensions" plugin (this method will auto-detect its presence).
	 *
	 * The options argument for ajaxForm works exactly as it does for ajaxSubmit.  ajaxForm merely
	 * passes the options argument along after properly binding events for submit elements and
	 * the form itself.  See ajaxSubmit for a full description of the options argument.
	 *
	 *
	 * @example
	 * var options = {
	 *     target: '#myTargetDiv'
	 * };
	 * $('#myForm').ajaxSForm(options);
	 * @desc Bind form's submit event so that 'myTargetDiv' is updated with the server response
	 *       when the form is submitted.
	 *
	 *
	 * @example
	 * var options = {
	 *     success: function(responseText) {
	 *         alert(responseText);
	 *     }
	 * };
	 * $('#myForm').ajaxSubmit(options);
	 * @desc Bind form's submit event so that server response is alerted after the form is submitted.
	 *
	 *
	 * @example
	 * var options = {
	 *     beforeSubmit: function(formArray, jqForm) {
	 *         if (formArray.length == 0) {
	 *             alert('Please enter data.');
	 *             return false;
	 *         }
	 *     }
	 * };
	 * $('#myForm').ajaxSubmit(options);
	 * @desc Bind form's submit event so that pre-submit callback is invoked before the form
	 *       is submitted.
	 *
	 *
	 * @name   ajaxForm
	 * @param  options  object literal containing options which control the form submission process
	 * @return jQuery
	 * @cat    Plugins/Form
	 * @type   jQuery
	 */
	$.fn.ajaxForm = function(options) {
		return this.ajaxFormUnbind().submit(submitHandler).each(function() {
			// store options in hash
			this.formPluginId = $.fn.ajaxForm.counter++;
			$.fn.ajaxForm.optionHash[this.formPluginId] = options;
			$(":submit,input:image", this).click(clickHandler);
		});
	};

	$.fn.ajaxForm.counter = 1;
	$.fn.ajaxForm.optionHash = {};

	function clickHandler(e) {
		var $form = this.form;
		$form.clk = this;
		if (this.type == 'image') {
			if (e.offsetX != undefined) {
				$form.clk_x = e.offsetX;
				$form.clk_y = e.offsetY;
			} else if (typeof $.fn.offset == 'function') { // try to use dimensions plugin
				var offset = $(this).offset();
				$form.clk_x = e.pageX - offset.left;
				$form.clk_y = e.pageY - offset.top;
			} else {
				$form.clk_x = e.pageX - this.offsetLeft;
				$form.clk_y = e.pageY - this.offsetTop;
			}
		}
		// clear form vars
		setTimeout(function() {
			$form.clk = $form.clk_x = $form.clk_y = null;
		}, 10);
	}
	;

	function submitHandler() {
		// retrieve options from hash
		var id = this.formPluginId;
		var options = $.fn.ajaxForm.optionHash[id];
		$(this).ajaxSubmit(options);
		return false;
	}
	;

	/**
	 * ajaxFormUnbind unbinds the event handlers that were bound by ajaxForm
	 *
	 * @name   ajaxFormUnbind
	 * @return jQuery
	 * @cat    Plugins/Form
	 * @type   jQuery
	 */
	$.fn.ajaxFormUnbind = function() {
		this.unbind('submit', submitHandler);
		return this.each(function() {
			$(":submit,input:image", this).unbind('click', clickHandler);
		});

	};

	/**
	 * formToArray() gathers form element data into an array of objects that can
	 * be passed to any of the following ajax functions: $.get, $.post, or load.
	 * Each object in the array has both a 'name' and 'value' property.  An example of
	 * an array for a simple login form might be:
	 *
	 * [ { name: 'username', value: 'jresig' }, { name: 'password', value: 'secret' } ]
	 *
	 * It is this array that is passed to pre-submit callback functions provided to the
	 * ajaxSubmit() and ajaxForm() methods.
	 *
	 * The semantic argument can be used to force form serialization in semantic order.
	 * This is normally true anyway, unless the form contains input elements of type='image'.
	 * If your form must be submitted with name/value pairs in semantic order and your form
	 * contains an input of type='image" then pass true for this arg, otherwise pass false
	 * (or nothing) to avoid the overhead for this logic.
	 *
	 * @example var data = $("#myForm").formToArray();
	 * $.post( "myscript.cgi", data );
	 * @desc Collect all the data from a form and submit it to the server.
	 *
	 * @name formToArray
	 * @param semantic true if serialization must maintain strict semantic ordering of elements (slower)
	 * @type Array<Object>
	 * @cat Plugins/Form
	 */
	$.fn.formToArray = function(semantic) {
		var a = [];
		if (this.length == 0) return a;

		var form = this[0];
		var els = semantic ? form.getElementsByTagName('*') : form.elements;
		if (!els) return a;
		for (var i = 0, max = els.length; i < max; i++) {
			var el = els[i];
			var n = el.name;
			if (!n) continue;

			if (semantic && form.clk && el.type == "image") {
				// handle image inputs on the fly when semantic == true
				if (!el.disabled && form.clk == el)
					a.push({name: n + '.x', value: form.clk_x}, {name: n + '.y', value: form.clk_y});
				continue;
			}
			var v = $.fieldValue(el, true);
			if (v == null || v == 'null') continue;
			if (v.constructor == Array) {
				for (var j = 0, jmax = v.length; j < jmax; j++)
					a.push({name: n, value: v[j]});
			}
			else
				a.push({name: n, value: v});
		}

		if (!semantic && form.clk) {
			// input type=='image' are not found in elements array! handle them here
			var inputs = form.getElementsByTagName("input");
			for (var i = 0, max = inputs.length; i < max; i++) {
				var input = inputs[i];
				var n = input.name;
				if (n && !input.disabled && input.type == "image" && form.clk == input)
					a.push({name: n + '.x', value: form.clk_x}, {name: n + '.y', value: form.clk_y});
			}
		}
		return a;
	};


	/**
	 * Serializes form data into a 'submittable' string. This method will return a string
	 * in the format: name1=value1&amp;name2=value2
	 *
	 * The semantic argument can be used to force form serialization in semantic order.
	 * If your form must be submitted with name/value pairs in semantic order then pass
	 * true for this arg, otherwise pass false (or nothing) to avoid the overhead for
	 * this logic (which can be significant for very large forms).
	 *
	 * @example var data = $("#myForm").formSerialize();
	 * $.ajax('POST', "myscript.cgi", data);
	 * @desc Collect all the data from a form into a single string
	 *
	 * @name formSerialize
	 * @param semantic true if serialization must maintain strict semantic ordering of elements (slower)
	 * @type String
	 * @cat Plugins/Form
	 */
	$.fn.formSerialize = function(semantic) {
		//hand off to jQuery.param for proper encoding
		return $.param(this.formToArray(semantic));
	};


	/**
	 * Serializes all field elements in the jQuery object into a query string.
	 * This method will return a string in the format: name1=value1&amp;name2=value2
	 *
	 * The successful argument controls whether or not serialization is limited to
	 * 'successful' controls (per http://www.w3.org/TR/html4/interact/forms.html#successful-controls).
	 * The default value of the successful argument is true.
	 *
	 * @example var data = $("input").formSerialize();
	 * @desc Collect the data from all successful input elements into a query string
	 *
	 * @example var data = $(":radio").formSerialize();
	 * @desc Collect the data from all successful radio input elements into a query string
	 *
	 * @example var data = $("#myForm :checkbox").formSerialize();
	 * @desc Collect the data from all successful checkbox input elements in myForm into a query string
	 *
	 * @example var data = $("#myForm :checkbox").formSerialize(false);
	 * @desc Collect the data from all checkbox elements in myForm (even the unchecked ones) into a query string
	 *
	 * @example var data = $(":input").formSerialize();
	 * @desc Collect the data from all successful input, select, textarea and button elements into a query string
	 *
	 * @name fieldSerialize
	 * @param successful true if only successful controls should be serialized (default is true)
	 * @type String
	 * @cat Plugins/Form
	 */
	$.fn.fieldSerialize = function(successful) {
		var a = [];
		this.each(function() {
			var n = this.name;
			if (!n) return;
			var v = $.fieldValue(this, successful);
			if (v && v.constructor == Array) {
				for (var i = 0,max = v.length; i < max; i++)
					a.push({name: n, value: v[i]});
			}
			else if (v !== null && typeof v != 'undefined' && v != 'null')
				a.push({name: this.name, value: v});
		});
		//hand off to jQuery.param for proper encoding
		return $.param(a);
	};


	/**
	 * Returns the value(s) of the element in the matched set.  For example, consider the following form:
	 *
	 *  <form><fieldset>
	 *      <input name="A" type="text" />
	 *      <input name="A" type="text" />
	 *      <input name="B" type="checkbox" value="B1" />
	 *      <input name="B" type="checkbox" value="B2"/>
	 *      <input name="C" type="radio" value="C1" />
	 *      <input name="C" type="radio" value="C2" />
	 *  </fieldset></form>
	 *
	 *  var v = $(':text').fieldValue();
	 *  // if no values are entered into the text inputs
	 *  v == ['','']
	 *  // if values entered into the text inputs are 'foo' and 'bar'
	 *  v == ['foo','bar']
	 *
	 *  var v = $(':checkbox').fieldValue();
	 *  // if neither checkbox is checked
	 *  v === undefined
	 *  // if both checkboxes are checked
	 *  v == ['B1', 'B2']
	 *
	 *  var v = $(':radio').fieldValue();
	 *  // if neither radio is checked
	 *  v === undefined
	 *  // if first radio is checked
	 *  v == ['C1']
	 *
	 * The successful argument controls whether or not the field element must be 'successful'
	 * (per http://www.w3.org/TR/html4/interact/forms.html#successful-controls).
	 * The default value of the successful argument is true.  If this value is false the value(s)
	 * for each element is returned.
	 *
	 * Note: This method *always* returns an array.  If no valid value can be determined the
	 *       array will be empty, otherwise it will contain one or more values.
	 *
	 * @example var data = $("#myPasswordElement").fieldValue();
	 * alert(data[0]);
	 * @desc Alerts the current value of the myPasswordElement element
	 *
	 * @example var data = $("#myForm :input").fieldValue();
	 * @desc Get the value(s) of the form elements in myForm
	 *
	 * @example var data = $("#myForm :checkbox").fieldValue();
	 * @desc Get the value(s) for the successful checkbox element(s) in the jQuery object.
	 *
	 * @example var data = $("#mySingleSelect").fieldValue();
	 * @desc Get the value(s) of the select control
	 *
	 * @example var data = $(':text').fieldValue();
	 * @desc Get the value(s) of the text input or textarea elements
	 *
	 * @example var data = $("#myMultiSelect").fieldValue();
	 * @desc Get the values for the select-multiple control
	 *
	 * @name fieldValue
	 * @param Boolean successful true if only the values for successful controls should be returned (default is true)
	 * @type Array<String>
	 * @cat Plugins/Form
	 */
	$.fn.fieldValue = function(successful) {
		for (var val = [], i = 0, max = this.length; i < max; i++) {
			var el = this[i];
			var v = $.fieldValue(el, successful);
			if (v === null || typeof v == 'undefined' || (v.constructor == Array && !v.length))
				continue;
			v.constructor == Array ? $.merge(val, v) : val.push(v);
		}
		return val;
	};

	/**
	 * Returns the value of the field element.
	 *
	 * The successful argument controls whether or not the field element must be 'successful'
	 * (per http://www.w3.org/TR/html4/interact/forms.html#successful-controls).
	 * The default value of the successful argument is true.  If the given element is not
	 * successful and the successful arg is not false then the returned value will be null.
	 *
	 * Note: If the successful flag is true (default) but the element is not successful, the return will be null
	 * Note: The value returned for a successful select-multiple element will always be an array.
	 * Note: If the element has no value the return value will be undefined.
	 *
	 * @example var data = jQuery.fieldValue($("#myPasswordElement")[0]);
	 * @desc Gets the current value of the myPasswordElement element
	 *
	 * @name fieldValue
	 * @param Element el The DOM element for which the value will be returned
	 * @param Boolean successful true if value returned must be for a successful controls (default is true)
	 * @type String or Array<String> or null or undefined
	 * @cat Plugins/Form
	 */
	$.fieldValue = function(el, successful) {
		var n = el.name, t = el.type, tag = el.tagName.toLowerCase();
		if (typeof successful == 'undefined') successful = true;

		if (successful && (!n || el.disabled || t == 'reset' || t == 'button' ||
						   (t == 'checkbox' || t == 'radio') && !el.checked ||
						   (t == 'submit' || t == 'image') && el.form && el.form.clk != el ||
						   tag == 'select' && el.selectedIndex == -1))
			return null;

		if (tag == 'select') {
			var index = el.selectedIndex;
			if (index < 0) return null;
			var a = [], ops = el.options;
			var one = (t == 'select-one');
			var max = (one ? index + 1 : ops.length);
			for (var i = (one ? index : 0); i < max; i++) {
				var op = ops[i];
				if (op.selected) {
					// extra pain for IE...
					var v = $.browser.msie && !(op.attributes['value'].specified) ? op.text : op.value;
					if (one) return v;
					a.push(v);
				}
			}
			return a;
		}
		return el.value;
	};


	/**
	 * Clears the form data.  Takes the following actions on the form's input fields:
	 *  - input text fields will have their 'value' property set to the empty string
	 *  - select elements will have their 'selectedIndex' property set to -1
	 *  - checkbox and radio inputs will have their 'checked' property set to false
	 *  - inputs of type submit, button, reset, and hidden will *not* be effected
	 *  - button elements will *not* be effected
	 *
	 * @example $('form').clearForm();
	 * @desc Clears all forms on the page.
	 *
	 * @name clearForm
	 * @type jQuery
	 * @cat Plugins/Form
	 */
	$.fn.clearForm = function() {
		return this.each(function() {
			$('input,select,textarea', this).clearFields();
		});
	};

	/**
	 * Clears the selected form elements.  Takes the following actions on the matched elements:
	 *  - input text fields will have their 'value' property set to the empty string
	 *  - select elements will have their 'selectedIndex' property set to -1
	 *  - checkbox and radio inputs will have their 'checked' property set to false
	 *  - inputs of type submit, button, reset, and hidden will *not* be effected
	 *  - button elements will *not* be effected
	 *
	 * @example $('.myInputs').clearFields();
	 * @desc Clears all inputs with class myInputs
	 *
	 * @name clearFields
	 * @type jQuery
	 * @cat Plugins/Form
	 */
	$.fn.clearFields = $.fn.clearInputs = function() {
		return this.each(function() {
			var t = this.type, tag = this.tagName.toLowerCase();
			if (t == 'text' || t == 'password' || tag == 'textarea')
				this.value = '';
			else if (t == 'checkbox' || t == 'radio')
				this.checked = false;
			else if (tag == 'select')
				this.selectedIndex = -1;
		});
	};


	/**
	 * Resets the form data.  Causes all form elements to be reset to their original value.
	 *
	 * @example $('form').resetForm();
	 * @desc Resets all forms on the page.
	 *
	 * @name resetForm
	 * @type jQuery
	 * @cat Plugins/Form
	 */
	$.fn.resetForm = function() {
		return this.each(function() {
			// guard against an input with the name of 'reset'
			// note that IE reports the reset function as an 'object'
			if (typeof this.reset == 'function' || (typeof this.reset == 'object' && !this.reset.nodeType))
				this.reset();
		});
	};

})(jQuery);