function ImageOff(imgname){
	var OnImg;
	var Active = new Image();
	if (document.images)
		Active.src = "img/"+imgname+".gif";
		document[imgname].src = Active.src;
}

function ImageOn(imgname){
	var OffImg;
	var Inactive = new Image();
	if (document.images)
	Inactive.src = "img/"+imgname+"_on.gif";
		document[imgname].src = Inactive.src;
}