Custom Services

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Another question

I made a web service so i can search for albums and artist in Rate Your Music site. Everything works fine.
Now i am trying a service for ProgArchives. But i don't want the service to search with the entire artist name, but only with the first letter of the Artist/Band. How can i manage that?

Here is the URL link when you search by letter in the web site:
http://www.progarchives.com/bands-alpha.asp?letter=c
This link will show all the band starting with the letter "C"

Here is the code i made, but of course it search's with the whole artist name and is not bring any results:

<services>
<!-- ProgArchives Artist/Band Search By Letter -->
<service name = 'ProgArchive'
action='web@http://www.progarchives.com/bands-alpha.asp?letter=%artist%'
appliesto='%artist%'
creator='wcpaeb'/>
</services>

Any suggestions?

Thanks in advanced