function emailform_onsubmit() 
{
   var returnValue = false;
   if (document.emailform.From.value == "")
   {
      alert("Please enter your e-mail address");
      document.emailform.From.focus();
   }
   else if (document.emailform.To.value == "")
   {
      alert("Please enter your friends e-mail address");
      document.emailform.To.focus();
   }
   else
   {
      returnValue = true;
   }
   return returnValue;
}