Browser Plug-In

I would like the skeleton of a browser plug-in. This should add a custom button to the browser toolbar. Clicking the custom button will open a window. I would like to be able to load the window via ajax (preferred) or a call to a web service. The plug-in should work with three browsers: IE (7 and above), Firefox, and Chrome. ## Deliverables I would prefer one (1) version of the plug-in that can work on the three browsers I mentioned. If this is too onerous, then 3 versions of the plug-in could be developed. I would then develop a page? that would detect (or perhaps ask the user for) the plug-in for a particular browser.