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

function changeImage(layer,imgName,imgObj)
{
	if (document.images)
	{
	;	if (document.layers && layer!=null) eval('document.'+layer+'.document.images["'+imgName+'"].src = '+imgObj+'.src')
            else document.images[imgName].src = eval(imgObj+".src")
	}
}