[jQuery] page_request.send(null)

www.naturalskin.com

I'm getting an error win LINE 30 with Firebug.... I'm using AJAX
Includes to load in external content. Everything looks great and
works fine, but I keep getting an error"

global.js (line 30)
page_request.send(null)

Should I delete this line?
Should I add something in the line?

Erik