xsp call url

[Adriano Smith]

i have a file read.xsp which is called for the url http://xx/mail?key=login&ud=user&pwd=pass ie read.xsp is the generator. 3 parameters are passed in the url. Now from the xsp, is it possible to redirect to another url based on the value of parameter 'key'. However the parameters 'ud' and 'pwd' should be passed to the next url as parameters. http://x.com/mail/login?ud=user&pwd=pass