function checkform ( form )
{

  if (form.name.value == "") {
    alert( "Please enter your name." );
    form.name.focus();
	form.name.style.border="2px solid #f00";
	form.name.style.background="#FFD9D9";
    return false ;
  }
  
    if (form.email_addr.value == "") {
    alert( "Please enter your email address." );
    form.email_addr.focus();
	form.email_addr.style.border="2px solid #f00";
	form.email_addr.style.background="#FFD9D9";
    return false ;
  }

    if (form.msg.value == "") {
    alert( "Please enter a message." );
    form.msg.focus();
	form.msg.style.border="2px solid #f00";
	form.msg.background="#FFD9D9";
    return false ;
  }

	return true ;
}