facebook integration of flash site wider than 760px

We have published a flash website that is 900px wide. The users of the website should be able to publish on their facebook wall.

So we've integrated the website as a facebook app and we are using the javascript SDK to publish on facebook walls.

Everything is running smoothly, except that when a user publishes on his wall, the system ads a via link, with the name of the app.

This link redirects to the facebook page of the application. (we don't want that) The website is integrated with the iFrame method, but as it is 900px, it obviously does not fit in the iFrame.

ideally, the via : appName link should redirect to the e开发者_运维技巧xternal website, instead of the facebook page.

Is there any workaround ?