function SelectBoxSelectAllOrNone(clientid, allornone)
{
    var selectbox = document.getElementById(clientid);
    
    for(i=0; i < selectbox.options.length; i++)
    {
        if(allornone == 'all')
        {
            selectbox.options[i].selected = true;
        }
        else
        {
            selectbox.options[i].selected = false;
        }
    }
}