Pop up problem on the web

I’ve used the centered pop-up window tutorial code with success in the past, and I’m trying to use it again for my portfolio site. The problem is, the pop-ups work just fine on my local computer when testing in a browser, but not online. I click on the button, and nothing happens. The link to this is http://www.stage16.net (click on ‘portfolio,’ then ‘digital’) each of those examples should be opening up in a new window. Here’s a .zip containing the relevant files [URL=“http://web.ics.purdue.edu/~rstremke/popup_problem.zip”]http://web.ics.purdue.edu/~rstremke/popup_problem.zip

Any help would be appreciated. Thanks.