OK...now I solve the problem.
I needed to have 3 columns. But I don't have 3 different positions on mainbody_bottom, or top _bottom. I thought that the NSP had the posibility to set the thumbnails, in order to have (par example) 3 columns. Today I try to install the grid module, and now all works.
Sorry, I have wasted your time!
but I don't think about Grid, (your fantastic idea)...
only 1 question: in your DEMO, you use Grid? or anoder way to set the NSP?
THANKS!