function validate_callback()
{
	name1=document.getElementById('name');
	phone=document.getElementById('telephone');
	if (name1.value=='')
	{
		alert("Please enter your name.");
		name1.focus();
		return false;
	}
	if (phone.value=='')
	{
		alert("Please enter your phone number.")
		phone.focus();
		return false;
	}
	return true;	
}