The site appears to work without js enabled, except for dismissal of that popup. Perhaps you could default the popup as display:none and bring it up with js? Certainly I was able to set a goal and check in without js (well done!) except that I had to inspect element and delete the popup to do so.
The popup only appears the first time any given detail page is loaded, even if javascript is disabled. Reloading the page should clear it. The close button on the dialog now does this if there is no javascript.
