/**
* 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).removeClass(settings.labelledClass);
}
}).blur(function(){
if (this.value === this.defaultValue) {
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
this.value = $(this).data("label");
$(this).addClass(settings.labelledClass);

});
};