/*  Faculty Homepage Banner Rollover
 	Switches the image for the main banner on the faculty hompage. 
	
    Updated: Wed 25.02.09 - Caroline
   ----------------------------------------------------*/

$(document).ready(function(){
	
	//Image preloader function
	jQuery.preloadImages = function() {
		var a = (typeof arguments[0] == 'object')? arguments[0] : arguments;
		for(var i = a.length -1; i > 0; i--) {
			jQuery("<img>").attr("src", a[i]);
		}
	}
	
	//Default image and description
	var defaultbg = $("img",'#promo-image').attr("src");
	var defaultdesc = $('img','#promo-image').attr("alt");
	
	var preload = new Array();
	
	$('a','#left_menu').each(function(i, el) {
		var rel = $(el).attr('rel');
		
		//Apply mouseover effect if relevant ID has been specified
		if (rel != null && rel.length > 0) {
			
			var desc = $(el).attr('title');
			
			preload[i] = rel;
			
			$(el).mouseover(function() {			
				$("img",'#promo-image').attr("src", rel);
				$("img",'#promo-image').attr("alt", desc);
			});
			
			//$(el).mouseout(function() {
			//	$("img",'#promo-image').attr("src", defaultbg);
				//$("img",'#promo-image').attr("alt", defaultdesc);
			//});
		
		}
	});
	$.preloadImages(preload);
});