function chkFormular()
{
 if(document.Formular.vorname.value == "")
  {
   alert("Please enter your first name!");
   document.Formular.vorname.focus();
   return false;
  }
 if(document.Formular.nachname.value == "")
  {
   alert("Please enter your surname!");
   document.Formular.nachname.focus();
   return false;
  }
 if(document.Formular.land.value == "")
  {
   alert("Please enter your country!");
   document.Formular.land.focus();
   return false;
  }
 if(document.Formular.email.value == "")
  {
   alert("Please enter your e-mail address!");
   document.Formular.email.focus();
   return false;
  }
      if(document.Formular.email.value.indexOf('@') == -1)
  {
   alert("No valid e-mail!");
   document.Formular.email.focus();
   return false;

  }
}