function Zugang()
{
  var checkname = document.Download.Login.value;
  var checkpass = document.Download.Passwort.value;

  if(navigator.appName == "Microsoft Internet Explorer") {  
    var seite = 'download/' + checkname + '/' + 'index.html';
  } else {
  	var seite = 'http://' + checkname + ':' + checkpass + '@download.lemleipzig.com/' + checkname + '/index.html';
  }

  var newWindow = window.open(seite,"newWindow");
}