var vtcontrol_viewer = null;
function vtcontrol_viewThumbnail(url,width,height) {
    //var _x = (screen.width/2) - (width/2);
    //var _y = (screen.height/2) - ((height/2)-50);
    var _x = 20;
    var _y = _x;
    vtcontrol_viewer = window.open(url,"vtcontrol_viewer","location=0,menubar=0,resizable=0,toolbar=0,status=1,width=" + width + ",height=" + height + ",left=" + _x + ",top=" + _y)
    vtcontrol_viewer.focus();
}