Problem with javascripts.

I`ve installed wordpress 2.2.1 to my website. Whenever I logged in as admin and trying to write anything clicking the write menu of my admin panel the page opens with an error.

It`s says “Error on Page” . My browser is showing that. IE shows this error as javascript errors.

I could not write anything in the page content box or could not paste anything there. The visual and code buttons are also not functioning .

But it is astonishing that Page Title field is writable.

I could not add categories also. Whenever I put a category name and the slug name in the field provided and click the submit button, nothing happens. The page does`nt redirect and the category is not added.

Is this problem related with file permissions change?

I`ve followed this thread http://wordpress.org/support/topic/50863?replies=15 in this regard. But no change happened.

Which are the files whose permissions are to be changed here?

Can anyone direct me to right path ? Any feedback is highly appreciated.