function OpenWindow(winname, url, height, width)
{
        var left = (screen.width/2)-(width/2);
        var top = (screen.height/2)-(height/2);
        window.open(url,winname,"width=" + width + ",height=" + height + ",top=" + top + ",left=" + left + ",toolbar=no,addressbar=no,location=no,menubar=no,titlebar=no,status=no,resizable=yes,scrollbars=yes");
}