serverside onclick for ?

I have a radiobuttonlist .. where I added <a href=http://forums.asp.net/AddPost.aspx?ForumID=18# onclick="javascript:alert('hi');"> .. it works when I click on the link under the radiobutton selection. Now, I need to also program from code-behind when this link is cilck .. how do I do that? I added <a href=http://forums.asp.net/AddPost.aspx?ForumID=18# onclick="javascript:alert('hi');" runat="server", id , onserverclick=trackLog> ... doesn't seem to be calling the TrackLog function ...
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