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When I try your search page with IE 8 it does not produce a script error for me. I see that no results are returned by the search.
Most likely problem is that it cannot write to the file system to create the index files. You need to make the /Data folder writable so it can create the index at /Data/Sites/1/index/
Does the folder exist? Do you see any files in this folder? If not then its a file permission issue.
You might also look for related errors in the mojoportal log at Administration > System Log
Hope it helps,