Re-enable search button

Problem: if a user clicks the back arrow to search again, the search button will not work. This is caused by the “disable_with” command, the button stays disabled, even after returning to the page.

Let's re-enable it after leaving the page, so that it will be ready for another search. Plus two minor fixes: there was a closing div tag with no counterpart, and javascripts were included at the bottom of the page, blocking the use of included libraries like jQuery for page-specific scripts, like this re-enabling one.