Most of the gaming sites at my work are blocked as well =( There is a nice little thing you can download and throw on a webserver somewhere that gets around all of that =) You can download it here:
http://www.sourceforge.net/projects/poxy/ Its called PHProxy. You just point your browser to where you copied these files at and there is another box, you just type in the URL, and you are good to go, your browser always just points to the site you copied the files to, and not the site you are seeing =)