Hi Andrea,
the javascript problem should be solved now (I haven't IE to test it!) both in contrib and in the test site.
About the "search this site" option, I've to examine Google's API to see it it's possible but I haven't time to do it just now. I've a new Post-It in the wall remembering it!
Ciao
Installing and upgrading help
How do I add Google search capability to my site?
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