ehynds/jquery-ui-multiselect-widget — pull request #273 by dtaniwaki (2012-06-25 08:55:49+00:00)
Title: We need id attribute to use this plugin with jQuery-Validation-Engine.

https://github.com/posabsolute/jQuery-Validation-Engine

We can use jQuery-Validation-Engine with this great plugin only if the button has id attribute. Could you merge this code change?