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 = "img/grafik_studenttop.gif";
	image1on = new Image();
	image1on.src = "img/grafik_studenttop2.gif";
	image1alt = new Image();
	image1alt.src = "img/grafik_studenttop2.gif";
	
	image2 = new Image();
	image2.src = "img/button_1.gif";
	image2on = new Image();
	image2on.src = "img/button_2.gif";
	image2alt = new Image();
	image2alt.src = "img/button_2.gif";
	
	image3 = new Image();
	image3.src = "img/button_1.gif";
	image3on = new Image();
	image3on.src = "img/button_2.gif";
	image3alt = new Image();
	image3alt.src = "img/button_2.gif";
	
	image4 = new Image();
	image4.src = "img/button_1.gif";
	image4on = new Image();
	image4on.src = "img/button_2.gif";
	image4alt = new Image();
	image4alt.src = "img/button_2.gif";
	

	
				
}
imagealt = ""
function imageon(name){
	if (imagealt != name){
        	document[name].src = eval(name + "on.src");
	}
}
function imageoff(name){
	if (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 (imagealt != name){
		if (imagealt != ""){
			document[imagealt].src = eval(imagealt + ".src");
		}
	}
	imagealt = name
	}
}


function MM_reloadPage(init) {  //reloads the window if Nav4 resized
  if (init==true) with (navigator) {if ((appName=="Netscape")&&(parseInt(appVersion)==4)) {
    document.MM_pgW=innerWidth; document.MM_pgH=innerHeight; onresize=MM_reloadPage; }}
  else if (innerWidth!=document.MM_pgW || innerHeight!=document.MM_pgH) location.reload();
}
MM_reloadPage(true);