I've added a down-and-dirty tutorial for adding a jQuery accordion control to your HISD web page -- if you so desire. And since you asked, an accordion is a graphical control element comprising a vertically stacked list of items, such as labels or thumbnails. Each item can be "expanded" or "stretched" to reveal the content associated with that item. I've created the CSS entries to make the control blend in with our existing theme.
You can get there by clicking the "jQuery Accordion Control" link to your left or by simply clicking here. On a scale of 1-10, I would rate the difficulty on this one at about a 7.