Help with proxy redirecting

Folks;
i have a question about redirecting proxy in Apache2.2.
I have a link for wiki called http://myserver.mmm.com
I have a configuration script which redirect this link to
http://myserver.mmm.com/wiki/dashboard

I want to be able to extract "wiki" out of this link so it can be redirected to something like http://myserver.mmm.com/dashboard (without /wiki in it)

Here's my script to redirect but when i use it i still get the wiki in the redirected link. Can you help me remove it please:

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<VirtualHost my IP:80>

ProxyRequests off
ErrorDocument 404 /index.html

<Proxy *>
Order deny,allow
Allow from all
</Proxy>

Redirect permanent / http://myserver.ptc.com/wiki

ProxyPass /wiki http://myserver.ptc.com:8080/wiki
ProxyPassReverse /wiki http://myserver.ptc.com:8080/wiki

</VirtualHost>

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