/**
 * --------------------------------------------------------------------
 * jQuery tree plugin
 * Author: Scott Jehl, scott@filamentgroup.com
 * Copyright (c) 2009 Filament Group 
 * licensed under MIT (filamentgroup.com/examples/mit-license.txt)
 * --------------------------------------------------------------------
 */
$.fn.tooltip = function(){
	//add body role
	if( !$('body').is('[role]') ){$('body').attr('role','application');}
	return $(this).each(function(){
		if( $(this).is('[data-hrefpreview],[title],[href^=#]') ){
                        var title;
                        var tmpTitle


			//generate a unique ID for the tooltip
			var ttID = 'tooltip-'+ Math.round( Math.random() * 10000 );
			//create tooltip container
			var tooltip = $('<div class="tooltip" role="tooltip" id="'+ttID+'"></div>');			
			
			//populate tooltip with content, depending on source
			if( $(this).is('[data-hrefpreview]') ){ //use ajax to retrieve data if data-hrefpreview attr is present
				tooltip.load( $(this).attr('data-hrefpreview') );
			}
			else if( $(this).is('[href^=#]') ){ //if local anchor, grab referenced content
				tooltip.append( $( $(this).attr('href') ) );
			}
			else if( $(this).is('[title]') ){ //if title attr is present, use that
				title = $(this);
                                tooltip.text(title.attr('title'));
			}


			//apply attrs and events to tooltipped element			
			var element = $(this).find("span");
                        try{
                        element.mouseover(function(e){
                                           
                                        tmpTitle = $(this).parent('label').attr('title');
                                        $(this).parent('label').attr('title',"");
					tooltip
						.appendTo('body')
                                                .text( tmpTitle )
						.removeClass('tooltip-hidden')
						.attr('aria-hidden',false)
						.css({
							top: e.pageY - tooltip.outerHeight(),
							left: e.pageX + 20
						});
				})
				.mouseout(function(){
                                        element.parent('label').attr('title', tmpTitle);
					tooltip.addClass('tooltip-hidden').attr('aria-hidden',true);
				});
                        }catch(e){
                            element.parent('label').attr('title', tmpTitle);
                        }
			
			//find an associated form field and set its describedby attr as well for a11y
			$('#' + $(this).attr('for')).attr('aria-describedby', ttID);		
			
			//append the tooltip to the page with hidden class applied
			tooltip
				.addClass('tooltip-hidden')
				.attr('aria-hidden',true)
				.appendTo('body');				
		}
	});
};