function chkFormular()
{
 if(document.Formular.name.value == "")  {
   alert("Please enter a name!");
   document.Formular.name.focus();
   return false;
  }
 if(document.Formular.email.value == "") {
   alert("Please enter a email adress!");
   document.Formular.email.focus();
   return false;
  }
 if(document.Formular.email.value.indexOf('@') == -1) {
   alert("This is not a correct email adress!");
   document.Formular.email.focus();
   return false;
  }
   if(document.Formular.email.value.indexOf('.') == -1) {
   alert("This is not a correct email adress!");
   document.Formular.email.focus();
   return false;
  }
 if(document.Formular.nachricht.value == "") {
   alert("Please enter a message!");
   document.Formular.nachricht.focus();
   return false;
  }
  if(document.Formular.nachricht.value.indexOf('<') == 0) {
   alert("Please no HTML!");
   document.Formular.nachricht.focus();
   return false;
   }
  }