/**
 * Open new browser's window in the center of the screen.
 *
 * @param url page's url.
 * @param windowName window's name.
 * @param width width of the window.
 * @param height height of the window.
 */
function openCenteredWindow(url, windowName, width, height) {
    var left = parseInt((screen.availWidth/2) - (width/2));
    var top = parseInt((screen.availHeight/2) - (height/2));
    var windowFeatures = "width=" + width + ",height=" + height + ",scrollbars,resizable, left=" + left + ",top=" + top;

    var popupWindow = window.open(url, windowName, windowFeatures);
    popupWindow.focus();
};

/**
 * Open new browser's window with address bar in the center of the screen .
 *
 * @param url page's url.
 * @param windowName window's name.
 * @param width width of the window.
 * @param height height of the window.
 */
function openCenteredWindowWithURL(url, windowName, width, height) {
    var left = parseInt((screen.availWidth/2) - (width/2));
    var top = parseInt((screen.availHeight/2) - (height/2));
    var windowFeatures = "width=" + width + ",height=" + height + ",location,scrollbars,resizable, left=" + left + ",top=" + top;

    var popupWindow = window.open(url, windowName, windowFeatures);
    popupWindow.focus();
};