Rails - May 2006 - Passing Muliple Parameters with remote_function

<select name="media" id="media" onchange="<%=
remote_function(
              :url => { :action => :show_performer_categories, 
:rate_group_id => @rate_group },
              :with =>
"''media_id=''+this.value''"
            )  %>">

I''m guessing that''s wrong since WebRick does nothign when I
call that
function...

However this works...

<select name="media" id="media" onchange="<%=
remote_function(
              :url => { :action => :show_performer_categories, },
              :with =>
"''media_id=''+this.value''"
            )  %>">

So my question.... how do you pass multiple parametes?  media_id I can 
get, the other I can''t.

thanks!

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