function validate_form ( )
{
    valid = true;

    if ( document.contact_form.name.value == "" )
    {
        alert ( "Please fill in your first name." );
        valid = false;
    }

	if ( document.contact_form.email.value == "" )
	{
        alert ( "Please give us your email address." );
        valid = false;
    }
    
  return valid; 
   
}