Problem in form Authentication

Dear All,
I have problem while calling my report from report server using URL METHOD.
we have config'red our reporting service using forms Authentication.
(so we have login page)
My problem is i have to call the report, using URL METHOD, by supressing
that login page
why becos, some Credentials i will get it from my aplication.
Pls guide me how to supress and call the report from codebehind using URL
METHOD.
Million of Thanx in advance
Gopal PrabhakaranYou need to Logon to the Report Server using the LogonUser() WebService
method