function preload(objName,objSrc) {
 if (document.images) {
  eval(objName+' = new Image()')
  eval(objName+'.src = "'+objSrc+'"')}}

function over(x) {
	if(document.images) {
	document[x].src = eval(x + "_over.src");}}

function out(x) {
	if(document.images) {
	document[x].src = eval(x + "_out.src");}}