function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function Rollover(img, show) {
  img.src = show.src;
}

var m1 = newImage("images/m1.gif");
var m1_on = newImage("images/m1_on.gif");
var m2 = newImage("images/m2.gif");
var m2_on = newImage("images/m2_on.gif");
var m3 = newImage("images/m3.gif");
var m3_on = newImage("images/m3_on.gif");
var m4 = newImage("images/m4.gif");
var m4_on = newImage("images/m4_on.gif");