ok, now I have used the ui.tabs.js of an older backup of my blog.
There is no version number in it, so I post here the code - perhaps it helps you, to find out, what's the problem is:
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By replacing the ui.tabs.js, that came with Wordpress 2.8.4, with this older file from Wordpress 2.7.1, I can see your plugin's option page well.
But now, I cannot drag and drop the widgets of Wordpress into the sidebar, this does not work any more with the old file of ui.tabs.js.
With the new version 1.7.2 (and 1.7.1) of ui.tabs.js the whole Wordpress 2.8.4 backend (and its widgets) works fine, but not your plugin.
