function checkIE_NC6() {
 isMac = (navigator.appVersion.indexOf("Mac")!=-1) ? true : false;
 NS4 = (document.layers) ? true : false;
 IEmac = ((document.all)&&(isMac)) ? true : false;
 IE4plus = (document.all) ? true : false;
 IE4 = ((document.all)&&(navigator.appVersion.indexOf("MSIE 4.")!=-1)) ? true : false;
 IE5 = ((document.all)&&(navigator.appVersion.indexOf("MSIE 5.")!=-1)) ? true : false;
 IE6 = ((document.all)&&(navigator.appVersion.indexOf("MSIE 6.")!=-1)) ? true : false;
 ver4 = (NS4 || IE4plus) ? true : false;
 NS6 = (!document.layers) && (navigator.userAgent.indexOf('Netscape')!=-1)?true:false;
 if(NS6 || IEmac || IE5 || IE6) {
  return true;
 } else {
  return false;
 }
}
function openKoinsLoginWindow() {
 var koinsurl='http://interface.koins.de';
 var jumpbackurl=escape(document.URL);
 var gotourl=koinsurl+'/login.php?PAID=13&set_sprache_id=1&action=regmain&jumpbackurl='+jumpbackurl;
 if(checkIE_NC6()==true) {
  window.open(gotourl, 'koinslogin', 'scrollbars=yes,status=yes,width=450,height=450,resizable=yes');
 } else {
  document.location.href=gotourl;
 }
}
document.write ('<a href="#" onClick="openKoinsLoginWindow();"><img src="http://interface.koins.de/bilder/loginbtn1.gif" width="88" height="23" alt="KOINS Login" border=0></a>');