function validate_form(nletter)
{

  
 if (nletter.EmailAddress.value == "")
  {
    alert("Please Enter Your Email Id");
    nletter.EmailAddress.focus();
    return (false);  
  }

 if (nletter.EmailAddress.value != "")
   {
	var your_Id=nletter.EmailAddress.value;
	var is_site_ok=your_Id.indexOf('@');
	var is_dot_ok=your_Id.indexOf('.');

	if ((is_site_ok==-1) || (is_dot_ok==-1))
 	{ 
 	 alert("Please Enter Correct Email Id");
	nletter.EmailAddress.focus();
    	return (false);
	}
  
}

return (true);
}