Ah yes, adding the WWW takes care of it in the browser.
Given that the site has been hacked on one or more occasion has any attempt been made to do a clean wipe of the SMF files, just retaining the database, in order to get rid of malignantly modified files? Or are there malignant entries in the database too? (It's been a long time since I've played around with an SMF install) I seem to recall someone upgrading or doing something else with the files in the past year or two.
The following is present in the source of every page on the site:
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