I'm new to .jsp and need to figure out how to mask parameters within a url.

I'm creating a simple page requiring passing several parameters through a url. I don't want to show these parameters in the url but would like to redefine them in an include that will be used across the board as a disclaimer for leaving my site. Can anyone help me figure out how to redefine the parameter once it has been passed through the url so if for instance my url was http://www.website.com/test.jsp?url=hawaii, I could post to a page that would have out.print of http://www.hawaii.gov for url=hawaii?

Thanks,
Richard Rivera