function addLoadEvent(func){
	var oldonload = window.onload;
	if(typeof window.onload != 'function'){
		window.onload=func;
	}else{
		window.onload=function(){
			oldonload();
			func();
		}
	}
	
}

function preloadImage(image)
{
  r=Math.random()*1000;
  //cache the images
  window['cache' + r] = new Image;
  window['cache' + r].src = image;
}