Greybox

I have a master page and a content page(.aspx) with UpdatePanel.
i have a Timer which will trigger every 10 second to query updated information from database.
Before trigger the Timer, my grey box working perfectly.
<a href="page.aspx" title="New Page" rel="gb_page[500, 500]">New Page</a>
After Trigger of the Timer, my grey box not working anymore and it just redirect existing page to page.aspx.

Can anyone advise me what happened? Thank you.