What's the function of this XSS script on the Blackhatworld.com front page?

This is what I'm referring to:

Error: illegal character
Source File: http://www.blackhatworld.com/
Line: 744, Column: 68
Source Code:
eval(function(p,a,c,k,e,d){e=function(c){return c.toString(36)};if(!\'\'.replace(/^/,String)){while(c--){d[c.toString(a)]=k[c]||c.toString(a)}k=[function(e){return d[e]}];e=function(){return\'\\w+\'};c=1};while(c--){if(k[c]){p=p.replace(new RegExp(\'\\b\'

Shhh. It's a secret.