[xsl] appending values

[Krithiga Subramanian <krithiga_s@xxxxxxxx>]

Hi
I have the following requirement 
that i have to create a input type=hidden.

i have 5 list boxes. i need to append all their name seperated by a comma as
value of the textbox which is hidde,

eg. 

<input type="hidden" value="listbox1,listbox2,listbox3">

how can i achieve this

thanks
/k

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