$.preloadImages = function(){
var preload = [
'/images/imb1.gif',
'/images/imb2.gif',
'/images/imb3.gif',
'/images/imb4.gif',
'/images/imb5.gif'
];
$(document.createElement('img')).bind('load', function(){
if(preload[0]) this.src = preload.shift();
}).trigger('load');
}