function HideIf(test_obj, test_value, hide_obj1, hide_obj2)
{
    var el = document.getElementById(test_obj);
    var style;

    if (el.value == test_value)
    {
        style = "hidden";
    }
    else
    {
        style = "visible";
    }
    
    document.getElementById(hide_obj1).style.visibility = style;
    document.getElementById(hide_obj2).style.visibility = style;
}