function validate_form(){
    if ( document.frmContactUs.frmName.value == "" ){
        alert ( "Please fill in your name." );
        document.frmContactUs.frmName.focus();
        return false;
    }
    if ( document.frmContactUs.frmEmail.value == "" ){
        alert ( "Please fill in your email address." );
        document.frmContactUs.frmEmail.focus();
        return false;
    }
    return true;
}