Jquery - IE not implemented error (in IE 8)

Question

I am having an IE not implemented JavaScript error and it seems not to have anything to do with what ive been reading on so far on this website.

Im using jquery.simp

Answer 1

.setExpression() and .removeExpression() are non-standard methods. In IE8 Microsoft removed support for them in standards mode (which the XHTML doctype triggers) because they were trying to make their browser more standards-compliant.

There's an issue in simplemodal's issue bug tracker discussing this. Apparently it has been fixed in version 1.4.1, but you're using 1.2.2. They must have stopped relying on these methods; you'll have to upgrade.