Have spent days trying to figure this, but maybe is not possible.

I am using jquery lightbox and a seperate main page navigation for multiple galleries each with a lighbox feature.

I would like to nest the jquery lightbox overlay within a div so it does not cover the whole window but only relates to the div it is in?

Reason being - I would like the main Navigation to be accessible without clicking on the overlay and I want the lightbox content to stay within set parameters ( i.e. the container for the page), not move around when different screen resolutions are used and thus not be aligned with main navigation bar and headings.

Any advice re: jquery script, addons, to use to make this possible, if at all possible. 
Or other suggestions would be much appreciated.

Thank you