[opposition]

I am trying to create this app will list users by state then they can filter down by age, race, etc. For example on the homepage i click on a state ( NY ) it lists the following:

Age: 18-25 (3 Users ) , 19-29 ( 5 Users )
Race: Asian (2 Users) , African American ( 2 Users ), Caucasian (4 Users )

If a user clicks on Age: 18-25 I want it to be able to pass the state and the age in the query string but how can I accomplish building the links to pass in the state and age or race on the fly?

Thanks!
That is exactly what I want done. I just need to be able to capture whats already passed in the query string and append it to the filters ( links )
Thank you for helping me out, the main reason I am doing querystrings is really for search engine purposes. If i use post it will not really help me out in my search engine rankings when the crawler comes to my site.

Thank you!