Client Side JavaScript and the Request Object

I know that you can gather data from a cookie with client-side javascript so is it also possible to get data from the Request object? (This is what it is called in ASP anyway).

Reason I need this is:
I have a page that sometimes has a variable passed by the GET method of a form - I need to get the value of this variable in client-side JavaScript.

Any ideas?

Store the variable in the location (i.e. "www.realisticgraphics.com/index.htm?MyVar=MyValue")

Then you can retreive that value through the location.search property.