isNetscape = (navigator.appName.indexOf("Netscape") >= 0);
isExplorer = (navigator.appName.indexOf("Explorer") >= 0);
roll_supported = (parseInt(navigator.appVersion) >= 3 && (isExplorer || isNetscape));
active_menu = 0;

function over(img) {
	if (roll_supported) {
		document.images[img].src="/img/" + img + "a.gif";
	}
}

function out(img) {
	if (roll_supported) {
		document.images[img].src="/img/" + img + ".gif";
	}
}

function preload(img) {
	load = new Image;
	load.src = img;
}