function validate_form ( )
{
    valid = true;

    if ( document.reviewform.name.value == "" )
    {
        alert ( "Please fill in the 'Name' box." );
        return false;
    }

    if ( document.reviewform.email.value == "" )
    {
        alert ( "Please fill in the 'Email' box." );
        return false;
    }

    if ( document.reviewform.review.value == "" )
    {
        alert ( "Please fill in the 'Store Review' box." );
        return false;
    }

    return valid;
}