Subscribe widget not opening in new window and won't center

I used the modified example in the query by ppat2 (modifying bfa_subscribe.php) to put all the subscription items on a single line, and it worked great. However, I can't seem to get them to open in new windows or tabs (on ffx or ie). I've tried rel="nofollow external" with no luck. Looking at the basic code, it should open in a new window, but it just doesn't seem to work (like it does at mashable). Any thoughts?