I didn't know there was distance expression.
i came up with something of my own, and just out of curiosity can't figure out why its wrong ;/
<img src="http://i.imgur.com/60vR4.jpg" border="0" />
:D my idea was that if difference between X was larger than radius (6) it would return positive amount and when added to Objects X the result would be automatically more then Objects X and event would not trigger.
oh nvm figured out
it was to be greater then or equal to