// Quick RollOvers -- WPT -- 10/12/02
// requires myImage.??? and myImage-over.??? in same folder
function qroll( btn ) {
	if (document.images){
		// deduce image and rollover image sources
		var src = btn.src;
		var dot = src.lastIndexOf(".");
		var oversrc = src.substring(0, dot) + "-over" + src.substring(dot);
		// preload rollover image
		var iload = new Image();
		iload.src = oversrc;
		// set image rollover functions
		btn.onmouseout = function(){ btn.src = src; }
		btn.onmouseover = function(){ btn.src = oversrc; }
		// prevent this function from being called on image swap
		btn.onload = null;
	}
}