Adding Collision With Sensor?!

So as you guys know in Bubble Ball there are speed boosts, I would like to know how to add a collision sensor to a picture such as the double arrows.
Help-
auksfrailco5

http://developer.anscamobile.com/reference/index/bodyissensor

btw this is the wrong part of the forum

views:2267 update:2011/9/17 17:36:17
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