function preload () {
var loadedImages = new Array;
for (i=0; i < preload.arguments.length; i++) {
loadedImages[i] = new Image();
loadedImages[i].src = preload.arguments[i];}
}

function show (where,img) { 
stor=where;
storedLocation=document.images[where].src;
document.images[where].src=img;
}

function hide () { 
document.images[stor].src=storedLocation;
}