Previous Ajax Call Interfering with New Ajax XML Call (update from previous post)

Previous Ajax Call Interfering with New Ajax XML Call (update from previous post)

Sorry guys. Wish there was a way to delete my previous post. The issue all along was something else. However, it's a weird one. 

I'm getting a Firebug XML response error that reads:

XML Parsing Error: not well-formed Location: moz-nullprincipal:{a258a2ce-874f-4563-8363-7286a3b56f82} Line Number 27, Column 29: 
... pos = data.search(/<\/html><div id="old-posts">/);

That's the code from my first .ajax() call when the page first loads and after the response is successful. 
How does ajax calls that's wrapped in two different functions interfere with each other?