Trying to find some JCink coding to work with as a base for something, but can't find anything that fits the bill.

All I need is a quick code for a little base template (doesn't need any custom colors, images, etc I should be able to handle all that myself) that starts at, say, 120x400px, expands to 400x400px when hovered, then shrinks back to 120x400px when the expanded area isn't being hovered. I can do basic coding, but hover/more advanced stuff I need a base to work with to figure it out xD