function x_popup ( obj ) {
    if($(obj).style.display == 'block') {
        $(obj).style.display = 'none';
    } else {

        if($('DISABLING_SCREEN') && ($(obj).style.position == "absolute" || $(obj).style.position == "fixed")) {
            $('DISABLING_SCREEN').style.top      = '0px';
            $('DISABLING_SCREEN').style.left     = '0px';
            $('DISABLING_SCREEN').style.width    = '100%';
            $('DISABLING_SCREEN').style.height   = document.body.clientHeight + 'px';
            $('DISABLING_SCREEN').style.display  = 'block';
        }
        $(obj).style.display = 'block';
    }
}
function x_popup_hide ( obj ) {
    if($(obj)) {
        $(obj).style.display = 'none';
        if($('DISABLING_SCREEN')) {
            $('DISABLING_SCREEN').style.display  = 'none';
        }
    }
}