How add URL parameter

Hi guys,

I have to add a parameter at the end of the URI for all the HTTP requests.

My problem is that the request URI could contain some parameter. How I can add a new one whether there is already parameters in the URI?

I wrote the following iRule and it works, but is not so elegant...

when HTTP_REQUEST {  
         if { [HTTP::uri] contains "?" } {
                HTTP::uri [HTTP::uri]&parameter=abc
         } else { 
                HTTP::uri [HTTP::uri]?parameter=abc
         }
}

Any other ideas?

Thanks!