In a reference where i can put instructions to do

Hello!,

     I have a file orden.txt, which contents:

1 "http://umbriel.lcc.uma.es:80/bienvenida.html"
2 "http://umbriel.lcc.uma.es:80/cl-http/siidepe/proyecto/ar10.html"
3 "http:...."
......

When I do click in this reference

            (ns4.0:note-anchor "Sgte" :target "display-pane":reference direc 
:stream stream),

I would like to change the value of 'direc' (if you click this reference), 
and i don't know where to put it. At first 'direct' have the value of 
"http://umbriel.lcc.uma.es:80/bienvenida.html", and when i click the 
reference i want that it have the value  of 
"http://umbriel.lcc.uma.es:80/clhttp/siidepe/proyecto/ar10.html",but  I 
don't where i have to put the instructions to do this.

Thank you very much.

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