Rails - Sep 2005 - syntax for updating sessions with check_box_tag

Hi All,

I have a session variable @session[:itemsChecked] in my controller and 
in my view, I have a check box, whenever the checkbox is clicked the 
value 1 should be put in the session, if unchecked the value should be 
removed.

<%= check_box_tag("result", 1, true,
:onclick=>{....something..}) %>
what should be the something?

Whats the best possible way to do this?

Regards
Gnan