function form_Validator(form)
{

 if (form.realname.value == "")
  {
    alert("Please enter your name.");
    form.realname.focus();
    return (false);
  }
  
 if (form.email.value == "")
  {
    alert("Please enter your email address.");
    form.email.focus();
    return (false);
  }
  
  if (form.phone.value == "")
  {
    alert("Please enter your contact number.");
    form.phone.focus();
    return (false);
  }
  
  if (form.product.value == "")
  {
    alert("Please choose a course from the dropdown box.");
    form.product.focus();
    return (false);
  }
  
  return (true);
  }