Hm. I think worst case scenario is that it just keeps checking for ever? I tested it not loading on the phone and it does not seem to impair performance at this point though who's to say what happens after I get the rest of the javascript in there.

The other thing I could do is attach the tabzilla script file with javascript and set up a call back once its loaded, this would prevent the repeated checking but might slow down the initial load.

I am hopeful that having tabzilla inside the position fixed element will actually save me headaches, since opening it will not affect the position of anything else on the page. *crosses fingers*

I'm not used to having to commit to something before seeing how it interacts with the rest of the page. If it turns out to be a problem later I guess I can switch to doing it this way https://firefoxflicks.mozilla.org/ but I'd like to stick to the design spec until it actually proves itself to be a problem.