var WindowObjectPopup;

function OpenPopup(strUrl, strTarget) {
    var windowWidth = 560;
    var windowHeight = 350;
    var windowLeft = 60;
    var windowTop = 40;

    if (WindowObjectPopup == null || WindowObjectPopup.closed) {
        WindowObjectPopup = window.open(strUrl, strTarget, "top=" + windowTop + ",left=" + windowLeft + ",width=" + windowWidth + ",height=" + windowHeight + ",resizable=0,status=0,toolbar=0,location=0,menubar=0,directories=0,scrollbars=0");
    }
    else {
        if (WindowObjectPopup.focus) WindowObjectPopup.focus();
    };
}