Including plugin javascript on the client side
Think you need:

UrlHelper::getResourceUrl('path/to/file.ext')


There is more info over at http://buildwithcraft.com/docs/plugins/resources

Edit

ok, scrap that answer, I didn't read the rest of the help page :) 

I think you are nearly there though. I'll have a test on my local machine and get back to you.

Edit 2

I believe I'm running into the same problem you have described as well. I did however get it working by doing this:

&lt;script src="{{ resourceUrl('eforms/js/public.js') }}"&gt;&lt;/script&gt;