Detecting Distance

I'll try to keep my question as simple as possible. I want on object to be able to detect its distance from the owner and return it in one numerical value (or 3 - x,y,z) doesn't really matter. Really, its because after the object I'm making fly's out, I want to have it run a check, and after it reaches a certain distance, I would like it to change states and do something else. I hope I made this as simple as possible. Any helpful hints or points in the right direction are greatly appreciated.

Thanks in advance.

llGetObjectDetails() should be your friend here. Something like:

(Note: not yet compiled; may need a minor syntax fix or two.)

// Returns negative distance if owner is not present (e.g. logged out or not in
// the same sim).
float getDistanceToOwner()
{
   list details = llGetObjectDetails(llGetOwner(), [ OBJECT_POS ]);
   if (llGetListLength(details) < 1)
   {
      return -1.0;
   }
   vector ownerPos = llList2Vector(details, 0);

   return llVecDist(llGetPos(), ownerPos);
}

Awesome socks, it worked perfectly for what I needed. And I was able to learn a few things too ;D