changing query string

[Vincent Apesa]

Hello all,
    I'm trying to modify the query string from the client before sending it
off again. I would like to do something like so:

http://www.xyz.com?one=1 and modify the uri to
http://www.xyz.com?one=2

the problem is I'm not sure how to reference values in the query string. I
would like to be able to say
queryArgs( 'one' ) = 2;

Is there something in place to do this or should I parse the query string
myself?
Can someone point me in the right direction?

thanks
Vince