Node cannot be inserted at the specified point in the hierarchy jQuery problem

Question

Ok so my website located here: http://www.here2four.com/of/ is a wordpress template that uses jquery to display recent posts. I finally tested the site with firebug and it gives me this error:

Node cannot be inserted at the specified point in the hierarchy" code: "3 Line 245 this.insertBefore( elem, this.firstChild );

Does anybody know why it would be doing this? I'm afraid this will be a problem when users visit using IE which will popup that annoying continue running scripts dialog.

Thanks!