function formok()
{    var n1 ="";
     var n2 ="";
     var n3 ="";
     var nf = 0;
     var tf = 0;
     var ef = 0;
     var erk = 0; /*erkenner*/
     var inmail = document.kontaktf.email.value;


 if(document.kontaktf.name.value == "")
   {
    n1="please fill in your name\n";
    nf = 1;
    erk =1;
   }
 if (document.kontaktf.tel.value == "")
    {
     n2="please fill in your phone number\n";
     tf = 1;
     erk = 1;
    }
 if ((inmail.indexOf('@') == -1)||(inmail.indexOf('.') == -1)||(inmail.length < 6 ))
     {
      n3="Email correct?\n";
      ef =1;
      erk = 1;
     }
  if (erk > 0)
      {
       alert(n1+n2+n3);
      	{
           if (nf ==1)
              {
               document.kontaktf.name.focus();
               return false;
               }
           else if (tf == 1)
              {
               document.kontaktf.tel.focus();
               return false;
               }
           else if (ef == 1)
              {
              document.kontaktf.email.focus();
              return false;
              }
        	}

      }
   else {
         return true;
        }
 }