Fix attribute values in selector expressions of  mark_special_links.js

According to http://api.jquery.com/category/selectors/attribute-selectors

If you activate the `mark_special_link.js` it breaks all js (ex. Menus/Overlays/etc.) in Plone 4.3rc1. 

![Screen shot 2013-03-26 at 6 54 10 PM](https://f.cloud.github.com/assets/437933/304497/3116a992-963e-11e2-8649-3a02b3b366da.png)