if (navigator.appName=='Netscape'&&!document.layers)
 { W3C=1;IE=0;N4=0; }
else
{
if (document.layers)
{ W3C=0;IE=0;N4=1; }
else
{ W3C=0;IE=1;N4=0;}
}




 function fensterauf (url,w,h,l,t)
{
window.open (url,"fenste1","width="+w+",height="+h+",left="+l+",top="+t+",scrollbars=yes,resizable=no")
}