/**
* jQuery.labelify - Display in-textbox hints
* Stuart Langridge, http://www.kryogenix.org/
* Released into the public domain
* Date: 25th June 2008
* @author Stuart Langridge
* @version 1.3
*
*
* Basic calling syntax: $("input").labelify();
* Defaults to taking the in-field label from the field's title attribute
*
* You can also pass an options object with the following keys:
*   text
*     "title" to get the in-field label from the field's title attribute 
*      (this is the default)
*     "label" to get the in-field label from the inner text of the field's label
*      (note that the label must be attached to the field with for="fieldid")
*     a function which takes one parameter, the input field, and returns
*      whatever text it likes
*
*   labelledClass
*     a class that will be applied to the input field when it contains the
*      label and removed when it contains user input. Defaults to blank.
*  
*/
jQuery.fn.labelify = function(settings) {
	settings = jQuery.extend({
		text: "title",
		labelledClass: ""
		}, settings);
		var lookups = {
			title: function(input) {
				return $(input).attr("title");
			},
			label: function(input) {
				return $("label[for=" + input.id +"]").text();
			}
		};
		var lookup;
		var jQuery_labellified_elements = $(this);
		return $(this).each(function() {
			if (typeof settings.text === "string") {
				lookup = lookups[settings.text]; // what if not there?
			} else {
				lookup = settings.text; // what if not a fn?
			};
			// bail if lookup isn't a function or if it returns undefined
			if (typeof lookup !== "function") { return; }
			var lookupval = lookup(this);
			if (!lookupval) { return; }

			// need to strip newlines because the browser strips them
			// if you set textbox.value to a string containing them    
			$(this).data("label",lookup(this).replace(/\n/g,''));
			$(this).focus(function() {
				if (this.value === $(this).data("label")) {
					//this.value = this.defaultValue;
					this.value = "";
					$(this).removeClass(settings.labelledClass);
				}
			}).blur(function(){
				//if (this.value === this.defaultValue) {
				if (this.value === "") {
					this.value = $(this).data("label");
					$(this).addClass(settings.labelledClass);
				}
			});

			var removeValuesOnExit = function() {
				jQuery_labellified_elements.each(function(){
					if (this.value === $(this).data("label")) {
						this.value = this.defaultValue;
						$(this).removeClass(settings.labelledClass);
					}
				})
			};

			$(this).parents("form").submit(removeValuesOnExit);
			$(window).unload(removeValuesOnExit);

			if (this.value !== this.defaultValue) {
				// user already started typing; don't overwrite their work!
				return;
			}
			// actually set the value
			if ($(this).attr('value') == "") {
				this.value = $(this).data("label");
				$(this).addClass(settings.labelledClass);
			};

		});
	};