var timer;
 if (navigator.appVersion.indexOf("2.") != -1){
	check = false;
	}
if ((navigator.appVersion.indexOf("3.") != -1) && (navigator.appName.indexOf("Explorer") != -1)){
	check = false;
	}
else
 {
	check = true;
	}
if (check == true){
	image1 = new Image();
	image1.src = "pics/buttons/ProjectsBlack.gif";
	image1on = new Image();
	image1on.src = "pics/buttons/ProjectsRed.gif";
	image1alt = new Image();
	image1alt.src = "pics/buttons/ProjectsRed.gif";

	image2 = new Image();
	image2.src = "pics/buttons/InsideBlack.gif";
	image2on = new Image();
	image2on.src = "pics/buttons/InsideRed.gif";
	image2alt = new Image();
	image2alt.src = "pics/buttons/InsideRed.gif";

	image3 = new Image();
	image3.src = "pics/buttons/OutsideBlack.gif";
	image3on = new Image();
	image3on.src = "pics/buttons/OutsideRed.gif";
	image3alt = new Image();
	image3alt.src = "pics/buttons/OutsideRed.gif";

	image4 = new Image();
	image4.src = "pics/buttons/ContactBlack.gif";
	image4on = new Image();
	image4on.src = "pics/buttons/ContactRed.gif";
	image4alt = new Image();
	image4alt.src = "pics/buttons/ContactRed.gif";

}
//hier muss je menue ein extra Variablenname gesetzt werden
Menue_imagealt = ""
function imageon(name){
	if (Menue_imagealt != name){
        	document[name].src = eval(name + "on.src");			
	}
}
function imageoff(name){
	if (Menue_imagealt != name){
        	document[name].src = eval(name + ".src");			
	}
}
function on(name){
        if (check == true){
	imageon(name);
	}
}
function off(name){
        if (check == true){
	imageoff(name);
	}
}
function alt(name){
	if (check == true){
	document[name].src = eval(name + "alt.src");
	if (Menue_imagealt != name){
		if (Menue_imagealt != ""){
			document[Menue_imagealt].src = eval(Menue_imagealt + ".src");
		}
	}
	Menue_imagealt = name
	}
}