function do_rollover(imgname){
	var onoff	= new RegExp("_on.");
	var myimage	= eval("document.images['" + imgname + "']");
	
	myimage.src = eval(imgname + ((myimage.src.match(onoff)) ? "_off" : "_on") + ".src");
}


function new_image(src){
	var newimage;
	
	newimage	= new Image();
	newimage.src	= src;
	
	return newimage;
}