IE6 does not handle errors in the same way as older versions - the issue is usually in the doctype (same as n6/mozilla) - removing the doctype putting the browser into "quirks" mode might resolve some things. Explorer 6 also has a quirks mode related to docytpe - for known bugs see below or css doctype issues
) the long standing error of using _ was changed - some browsers respecting the old rule still have to change, other finished products never will.