// A general-purpose popup window function
function popupWindow(uri, width, height) {
    var windowName = 'popup';
    if(arguments.length > 3) {
        windowName = arguments[3];
    }
    var popUp = window.open(uri, windowName, 'width=' + width + ',height=' + height + ',scrollbars=yes,resizable=yes,menubar=no,toolbar=no');
    if (typeof popUp == 'object') { popUp.focus(); }
}