var browserkennung = "nicht geprüft";
    var infozahler = 1;
    var ruck;
    var schrift = 8;
    var stil = 640;

     {
     if(navigator.appVersion.substring(0,1) >= "4") 
       {
       if(navigator.appName.substring(0,8) == "Microsof")  
          { 
            browserkennung="MS IE ab V4.0";
            if(screen.availWidth >= 1024)
                stil = 1024;
              else if(screen.availWidth >= 800)
                stil = 800;
              else 
                stil = 640;
          }

        else if(navigator.appName.substring(0,8) == "Netscape") 
          {
            browserkennung="NS ab V4.0";
            if(screen.availWidth >= 1024)
                stil = 1024;
              else if(screen.availWidth >= 800)
                stil = 800;
              else 
                stil = 640;
          }
        else 
          {
          browserkennung="nicht: MS/NS";
                stil = 640;
          }
          
       }

     else
       { 
       if(navigator.appName.substring(0,8) == "Microsof") browserkennung="MS IE bis V3";
                stil = 640;
       }

     }