Pop up problem

Hi guys,

Seems I am the most stupid guy here with many problems on simple stuff. I am trying to solve a problem to define the size of a pop up window.
I wrote

 
on (release) {
getURL ("www.blabla.bla", _blank); 
}

but it opens in a full window. The is no way I can get to define the size of popup, can anyone enlighten me please. I am walking in the dark…

And as I already ask is there a way that as a window opens, everything else gets darker ?

I looked through the entire forum but didnt find the answers to my problems.

Thank you very very much!!