'Masking' areas that you don't want clicked on

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Case in hand;

http://www.gimmick.i8.com/

If you hover over the ‘1800-Gimmick-tees’ sign, it will show pink labels, indicating which object does what. That’s good.
However, if you then hover over where the pink labels were, they also appear. The same happens with the TV.
Is there any way I can stop this? Like another layer that sits on top and stops people activating it from any place OTHER than the intended sign?

Thanks,

Rift