Thats nothing to do with the error, that error is IE crashing.
You may wish to try going to your UserCP, then options and disabling this option
Use vBCode quick links on your message input screens?
Enabling this option allows you to quickly manipulate different aspects of your posts including color, font, and size. In addition you can click on smilies to have them inserted into your posts. You may disable this option if it causes problems for you.