Error on ajax forms/links in jQuery UI tabs

I've implemented jQuery UI tabs, and I get an error:

When i submit a ajax form or link, it gets submitted multiple times.
As seen in this Doom console output:

DELETE http://localhost:3000/innmeldings/101 404 (Not Found)
DELETE http://localhost:3000/innmeldings/101 404 (Not Found)
DELETE http://localhost:3000/innmeldings/101 404 (Not Found)
DELETE http://localhost:3000/innmeldings/101 404 (Not Found)

The more times i switch betweens the tabs, the more times the ajax
link submits. I have googled it, but not found anything, which makes
me believe this is not a common error in the JQuery UI tabs.

Any idea what I do wrong?

I uses rails 3.05. I've tried different versions of jQuery og jQuery
Ui: