filename = new Array("Button01", "Button02", "Button03", "Button04");

if (document.images) {
	for (i=1; i<=filename.length; i++) {
		eval("Button0" + i + "a = new Image");
		eval("Button0" + i + "a.src = 'Images/" + filename[i-1] + "a.GIF'");
		eval("Button0" + i + "b = new Image");
		eval("Button0" + i + "b.src = 'Images/" + filename[i-1] + "b.GIF'");
	}
}

function ChangeOvr(num) {
	if (document.images) {
		document[filename[num-1]].src = eval(filename[num-1] + "b.src");
	}
}

function ChangeOut(num) {
	if (document.images) {
		document[filename[num-1]].src = eval(filename[num-1] + "a.src");
	}
}