Geting report url inside the report

Hello.
Is there a way in a report to get his url?
I'll explain what i want to do: I want to add an option to export the report to excel format with out useing the menu so i want to add a button (or a table cell) and give him,in the nevigation field, the same url of the rreport with the same parameters but add to him the command "rs:format=excel" and then by pressing the button it will automaticly export my report.
Thanks
From http://www.developmentnow.com/g/115_0_0_0_0_0/sql-server-reporting-services.ht
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http://www.developmentnow.comi was sure this is an easy one :)
if my question wasn't clear enough, please let me know.
Thanks in advance/