selecting one of all div(background) and onclick changing it

[apollo789]

I don't know anything about javascript.
i clickable background, bigger 480px, can be only 1 yellow background
https://jsfiddle.net/yx57fz5h/

[jscheuer1]

I see your demo up there and you obviously know something, because it's sort of working.

What I don't understand is the problem. Are you saying that sometimes you end up with two div that have the yellow background? If so, how can I make that happen? If not, just what is the problem?

Please take your time and describe in detail what the problem is.