function pop(url, width, height)
{
    var left = (screen.width - width) / 2;
    var top = 100;
    window.open(url, '_blank', 'width='+width+',height='+height+',top='+top+',left='+left+',toolbar=0,menubar=0,location=0,status=0,scrollbars=yes,resizable=1');
}