Get C# session variable using javascript

[Joe]

I am new to web development at all but maintaining a .NET
site that utilizes .apsx pages using vbscript,
javascript,and C#.

There is a function I am doing that I only can find out
how to do in javascript (direct url post to variable then
close window), however now I need to access a session
variable from that javascript. I could do it from a C#
page doing the following:

(string)HttpCon text.Current.Se ssion["myLearning Url"];

Anyone know how I can do it in javascript?

thanks