Problem with Web Auth

hi
i have two wireless networks,one for the guests and the other one extends the corporate network.i created two vlan on my 6509 swicth and mapped the vlns to to the wlans.All is working fine but when i enable web auth for guest i can no longer ping my gateway or browse and even web auth is not authenticating against the internal users configured on the WLC...web auth just wont work.
what could be wrong..i really need to authenticate using web auth.

ok, SO this is what i need
send me show custom-web details
S if you open the page do you get the default cisco webauth redirected page ; are you able to put the user name and password ?
can you send me the screen shot of events
Regards
Seema

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