browser = (((navigator.appName == "Netscape") && (parseInt(navigator.appVersion) >= 3 )) || ((navigator.appName == "Microsoft Internet Explorer") && (parseInt(navigator.appVersion) >= 4 )))

	if ( browser) {

	leis_off = new Image;
	leis_off.src = "files/menu_leistungen.gif";
	leis_on = new Image;
	leis_on.src = "files/menu_leistungen_on.gif";

	team_off = new Image;
	team_off.src = "files/menu_team.gif";
	team_on = new Image;
	team_on.src = "files/menu_team_on.gif";

	ref_off = new Image;
	ref_off.src = "files/menu_referenzen.gif";
	ref_on = new Image;
	ref_on.src = "files/menu_referenzen_on.gif";

	kon_off = new Image;
	kon_off.src = "files/menu_kontakt.gif";
	kon_on = new Image;
	kon_on.src = "files/menu_kontakt_on.gif";

	}

	function Swap(imgDocID,imgObjName) {
	    if ( browser) {
            document.images[imgDocID].src = eval(imgObjName + ".src")
            }
	}