back: opening the right accordion pane

[jdee]

When a user is viewing a list of results in an accordion, if they submit an invalid search term through the search form (e.g., "foo"), they will be redirected back to the page they were viewing, with an error that will fade shortly after the page loads. The accordion on that page will be open to the pane they were previously viewing (the information is stored in a cookie). This does not work when you click the back button after following a link (in the header bar, pagination footer or in a definition pane). The first pane in the accordion will be open after clicking back in this case.