JQuery :: Getting An Array Of Open Visible Div Tags?

i have a page that has a menu that inserts new div tags into a parent div tag called "content".

Each new div tag has the same class called "child".

So my page will look like this:

<div id="menu">
<a>Menu 1</a>
<a>Menu 2</a>
</div>

[Code]....

But my menu might have maybe 20 items, so up to 20 new div tags will be added into the "content" area. Is there a way that i can get all the "opened/visible" div tags inside the "content" div tag, and then loop through that array to find out information? (info i want is x & y co-ords, etc).

I am assuming that i should use a selector call, but i am unsure as to how to add it to an array.