[/html] With this option #3, we start with all of the <div>s hidden. If we click on one of the headings, the following <div> will slide down. If we click on the same heading again, that <div> will slide back up. Clicking on on any heading will also hide all of the other <div>s — the ones that don't immediately follow it. Therefore, no more than one <div> can be open a a time. To achieve this, we s