Obfuscation Script, Problem with Undefined Variables

[Psipherious]

The exact script I'm trying to get working is some code which hides the html for text or links on a page and uses ajax to display what should be in that spot on the page.

 

The scripts are down loadable here (in the zip file at the bottom of page) and the script also seems to be fully working on that site. Notice in the "Output" section.

 

http://rajeczy.com/arpad/lib/index.php?p=misc/obfuscate_ajax

 

If you run this script as it is, or at least... when I have tried running it as is, I get an error that "obr" is undefined.

 

I tried simply adding:

 

var obr;

 

But then I get a new error that "xmlhttp is null".

 

So I tried:

 

var xmlhttp = 0;

 

and a few other things similar to that, which doesn't seem to cause any additional errors, but the page / script still doesn't execute correctly and the output is not displayed or loaded.

 

I'm not really all too familiar with ajax myself, it's kind of an "on the side" thing for me, I more just focus on the php and database stuff so I'm kind of stuck with this, anyone have any idea what it is wrong with this script? Why the data isn't being displayed?