CS6 - how to get page number?

i have selected frame. I want to know page number, where it is.

aSel = app.selection[0];

alert (aSel.parent.name); - i get empty string

cause it' Object spread. And what to do then? (without losing of right/left reffering)

thanks

p.s. in CS3 i did it, and in CS6 i get stuck.