/* openwindow function for RN */
function openwindow(thewidth, theheight, url) {
    var windower
    var winTop = (screen.height / 2) - (theheight /2);
    var winLeft = (screen.width / 2) - (thewidth / 2);
    var windowFeatures = "";
    windowFeatures = windowFeatures + "width=" + thewidth + ",";
    windowFeatures = windowFeatures + "height=" + theheight + ",";
    windowFeatures = windowFeatures + "resizable=no,scrollbars=yes,"
    windowFeatures = windowFeatures + "left=" + winLeft + ",";
    windowFeatures = windowFeatures + "top=" + winTop;
    windower = window.open(url, "", windowFeatures);
}