Dealing with Query String

Hi, I need some help with query string. Basically what I am doing is I am sorting my table, much like you sort columns in OUTLOOK EXPRESS for instance with a little arrow... http://www.kulchitski.com/btl/btl.php?lang=eng&page=talkroom_show&sort=s ex So all I need a function that will grab this query and will change sort= and another new variable (desc/asc) and will return the same string but with new values for certain variables... I ran across some function like this before when Ididn't need it, but just now when I need it badly - can't seem to be able to find it. Hope someone out there can help. Thank you much. Vlad