Ok, so this takes care of it:

http://jsfiddle.net/DUhP6/181

Basically, I have to go up to chain until I find a specific div I can rely on.

The click on the outside container would then be as follow:

document.getElementById('outer-container').onclick = function(e) {
loTarget=e.target
while (loTarget.parentNode)
{
   loTarget=loTarget.parentNode
   if (loTarget.id=='DivIFrame')
   {
      return false
   }
}
alert('Clicked on outside window')
}

If someone knows a better or simpler way, feel free to share.