Move the cursor to the next section whenever the user completes a section of the lesson

[nickserv]

The page scrolls to the next section when the previous one is completed, but the cursor does not seem to move to the next section, which can be confusing.

[nickserv]

I managed to figure out how to hook into the section loading code so that the next section is focused after it is scrolled to. However, I'm having trouble focussing the first input textarea when the page loads.