//pop-up and center by url and width/height
function openWin(url, winWidth, winHeight) {
    var winLeft = (screen.width - winWidth) / 2;
    var winTop = (screen.height - winHeight) / 2;
    var newWindow = window.open(url, 'TLR', 'width='+winWidth+',height='+winHeight+',left='+winLeft+',top='+winTop+',statusbar=0,resizable=0,scrollbars=0,status=0,toolbar=0,menubar=0,location=0');
    newWindow.focus();
}