Popup windows, this has to be easier

ok so i have spent the last 3 days looking all over this site and threw tutorials and all i can find is these long complicated verisions of what I’m trying to do.

is there any way possible to have a thumbnail button that has actionscript to function like this…

on release
get url “az.jpg” _blank w=500 h=400

it just has to pop up the jpg in a new window and make is a specific size.
is there not an easy way to do this?