read screen position of object

[marinelife]

I found a javascropt that will allow objects to be moved around the screen by dragging and dropping objects with the mouse.

I have a poetry site and I would like people to be able to collect their poems into books. I have in mind using the above javascript so they can arrange them in order (a vertical list)

What I need is a script that would read where on the screen these objects are after they have been arranged by the user. Left to right is unimportant , just top to bottom. This could be relative position, relative to the topmost object. A hotspot (button) would trigger the read.

I do very little programming in Javascript; I do mostly PHP.

Know any sources or have any ideas?

Thanks