function OpenWinCenter(windowUri,windowHeight, windowWidth)
{
    var centerWidth = (window.screen.width - windowWidth) / 2;
    var centerHeight = (window.screen.height - windowHeight) / 2;
    newWindow = window.open(windowUri, 'resizable=yes,width=' + windowWidth + 
        ',height=' + windowHeight + 
        ',left=' + centerWidth + 
        ',top=' + centerHeight + ",menubar=no,resizable=yes,scrollbars=yes");

    newWindow.focus();
    return newWindow.name;
}