[flexcoders] looping ArrayCollection

[Mark]

I must be having some crazy brain cramp right now, I'm having a devil of a time 
with getting a loop to work properly.  I have an ArrayCollection that I need to 
get to data a level or two down (root>item>associated>fKey).  When I loop thru 
it it's fine unless there's only one item in there.. then I get an error.  My 
brain is fried.. can anyone tell me what the heck I'm doing here?

Thanks

Original XML:
<root>
  <item>
    <id>1</id>
    <associated><fKey>2</fKey><fKey>3</fKey></associated>
    <associated><fKey>2</fKey></associated>
    </item>
</root>

Loop:
for (var i:int = 0; i < stories.length; i++) {
                for (var j:int = 0; j < stories[i].associated.fKey.length; j++) 
{
                        trace(i + "  " + stories[i].associated.fKey[j]);
                }
        }