var brosys=navigator.appName+navigator.appVersion;
switch(brosys) 
{
case"Netscape5.0 (Macintosh; de-DE)":
var x=12;
var y=48;
break;
case"Microsoft Internet Explorer4.0 (kompatibel; MSIE 5.0; Macintosh; I; PPC)":
var x=12;
var y=48;
break;
case"Netscape5.0 (Windows; de-DE)":
var x=0;
var y=28;
break;
case"Microsoft Internet Explorer4.0 (compatible; MSIE 6.0; Windows NT 5.1)":
var x=0;
var y=28;
break;
default:
var x=0;
var y=0;
}