No doubt about your mathamtical mind for sure :-) That sounds great & a great product for you to be the proud papa of :-) I am sure we will all be on the same page soon. I want to understand that in our current scenario,
Patience from all please...let's follow this through :

if one is to reverse the u on the spheres  image then they would do same for IBL ( both set to -1 ?)
Bagginsbill, is this what you are saying about this one point? .... one step at a time

(cath U have site mail)