Change child window position on its parent window with JQuery

Change child window position on its parent window with JQuery

Hello,

first of all, I apologize for my bad English. I am a beginner with jquery and do not know their characteristics.
 
My problem: I have a web page (made with asp.net) and from there, I open a child window.

I need this child window opens on the left side and bottom of its parent window.

How can I do this with JQuery?
 
A greeting and thanks