<!--
var arImages=new Array();
function Preload() {
 var temp = Preload.arguments; 
 for(x=0; x < temp.length; x++) {
  arImages[x]=new Image();
  arImages[x].src=Preload.arguments[x];
 }
}

 /*this replaces your normal 'body' tag
 substitute your own image names*/
 /*
 < body onload="Preload('thing.png','anotherthing.png','etc etc.png')" >
 */

function cambiar(img_name, img_src)
{
document[img_name].src = img_src;
}
 -->