How To Limit A Collision Start

Hi I'm wanting to llStart_Collision(integer num_detected), only if the detected key is not an avatar. Can someone please tell me how, an example please??

Thanks

We only get the highly limited llCollisionFilter.

http://wiki.secondlife.com/wiki/LlCollisionFilter

It can only block out or accept only by Name or UUID.

I believe theres a JIRA out there for a more robust means of filtering collisions.

EDIT: My apoligies, I should have provided the existing means of doing this.

Make a check against llDetectedType for each entry you're interested in, in this case: if(llDetectedType(num) != AGENT)

EDIT2: Er, no, Its bitfield, so if(~llDetectedType(num) & AGENT)