function wechsel(url,bildname) {
 window.document.images[bildname].src = url;
 }

var email = "";

function checkEmail(e,z) {
	var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
		var x = z.mail.value;
		if(x == "") { 
			z.emailimg.style.visibility = "hidden"; 
		}
		else {z.emailimg.style.visibility = "visible"; }
		if(e==0) { 
			if (filter.test(x)) {
				z.emailimg.src = "images/mail_valid.png";
			}
			else {
				z.emailimg.src = "images/mail_invalid.png";
			}
		}	
}

function popup (url) {  
  fenster=window.open (url, "Verwaltungsbereich", "width=900, height=560, scrollbars=no,resizeable=no, status=0"); 
  fenster.focus ();  
} 

function browser() {
var name = "";
if (navigator.appName == "Microsoft Internet Explorer") { name = "ie"; }
else if(navigator.appName == "Netscape") {name = "net"; }
else {name = "kp";}
return name;
}