Originally Posted by bob jenkins

You might want to re-read the rule (or else I need to), because it doesn't say "adjacent to the division line." Instead, it says "adjacent to a front-court or back-court boundary line" -- by which they mean either the sideliine or either end-line.

The phrase isn't really needed (since all throw ins are adjacent to a boundary line), but it's there to empahsize that it doesn't matter whether the throw-in is adjacent to the front court or the back court.