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

function ImgPreload(img) {
 var b=new Image(); b.src=img; return b; 
 }

if(BrowserOK) {
 b1n=ImgPreload('http://www.oberlechner.com/interndeu.gif');
 b1h=ImgPreload('http://www.oberlechner.com/interndeux.gif');
 b2n=ImgPreload('http://www.oberlechner.com/internita.gif');
 b2h=ImgPreload('http://www.oberlechner.com/internitax.gif');
 b3n=ImgPreload('http://www.oberlechner.com/interneng.gif');
 b3h=ImgPreload('http://www.oberlechner.com/internengx.gif');
 b4n=ImgPreload('http://www.oberlechner.com/internned.gif');
 b4h=ImgPreload('http://www.oberlechner.com/internnedx.gif');
 }
 
function windowopen(loca, titolo,w,h){
 winopen = window.open(loca, titolo, "width="+w+",height="+h+",scrollbars=no,resizable=no,status=no,location=no,toolbar=no");
 }