function chkFormular()
{
 if(document.contactform.Name.value == "")  {
   alert("Please enter your name!");
   document.contactform.Name.focus();
   return false;
  } 
 if(document.contactform.Email.value == "") {
   alert("Please enter your email address!");
   document.contactform.Email.focus();
   return false;
  }
  if(document.contactform.Email.value.indexOf('@') == -1) {
   alert("Email address is not correct!");
   document.contactform.Email.focus();
   return false;
  }
 if(document.contactform.Subject.value == "0") {
   alert("Please choose a subject!");
   document.contactform.Subject.focus();
   return false;
  }if(document.contactform.Message.value == "")  {
   alert("Please enter your message!");
   document.contactform.Message.focus();
   return false;
  }

}