// check for ability to control images
var DoAni = false; // default
if (document.images) {
	DoAni = true; 
	// browser is able to control images: preload both bullets
	var Bullets = new Array(2);
	Bullets["standard"] = new Image();
	Bullets["standard"].src = "images/nav/inaktiv.gif";
	Bullets["aktiv"] = new Image();
	Bullets["aktiv"].src = "images/nav/aktiv.gif";
}

// MouseIn event handler
function MouseIn(which) {
	if (DoAni) {
		document[which].src = Bullets["aktiv"].src;
	}
	return true;
}

// MouseOut event handler
function MouseOut(which) {
	if (DoAni) {
		document[which].src = Bullets["standard"].src;
	}
}