function validate_form()
{
    valid = true;

    if ( document.contact_form.name.value == "" )
    {
        alert ( "Please fill in your name" );
        valid = false;
    }
	
	if ( document.contact_form.email.value == "" )
    {
        alert ( "Please fill in your email address" );
        valid = false;
    }
	
	if ( document.contact_form.message.value == "" )
    {
        alert ( "Please type a message" );
        valid = false;
    }

    return valid;
}