function chkFormular() {
 if(document.Formular.name.value == "")  {
   alert("Please enter your name!");
   document.Formular.name.focus();
   return false;
  }
 if(document.Formular.email.value.indexOf('@') == -1) {
   alert("Please enter email adress!");
   document.Formular.email.focus();
   return false;
  }
 if(document.Formular.nachricht.value == "") {
   alert("Please add something to message field!");
   document.Formular.nachricht.focus();
   return false;
  }
}