how do i use QueryString on html

[pelegk1]

on the client side?

[AdamGundry]

I presume you mean the GET information on the URL? If so, you can access it with the JS property window.location.search.

If you just need to extract name-value pairs to variables, check out this script:
http://www.agbs.co.uk/scripts/get_extract.html

Adam