function validate() {
  if(document.email_form.Id.value=="") {
    alert("Please enter your name");
    return false;
  }
  if(!isEmail(document.email_form.Email.value)) {
    alert("Invalid Email Address");
    return false;
  }
  if(document.email_form.Enquiry.value=="") {
    alert("Please enter your Enquiry");
    return false;
  }
  return true;
}