You really should have a fallback page for browsers with no Javascript. NoScript has become increasing popular and the "Javscript Free" page of a site is the first page those users will see (even if they go on to temporarily allow javascript for your app).

In your case, it is just a blank white page. Since you are asking for suggestions, I would suggest you just make it display a message. One for suggesting users with older browsers to download chrome or firefox and another message directed at those with Javascript intentionally disabled which gives a very brief outline of what your app does and why they should enable JS to play with it.

e: I clicked through to the other mashups you have created which you linked in your other comment. They all do the same thing, just bring me to a blank page.

ee: To those down-voting, what do you disagree with? Do you not think pure JS web apps should have HTML fallback pages or do you disagree with the way I said it?