What do you mean by "Page location"???
I think you want to move the group of frames to SLUG area.
I want a graphic object to be high on a page on page 1 of a book,
moving down so that it is near bottom of page by end of book. Halfway
thru book, halfway down page for example.
So my question is how do I have the page number affect the vertical
(y) position of an object?
Using a script doesn't make it 'live', the object will not be 'affected' after you move it once. But apart from that, it's pretty simple.
Given a current page number n, a number of pages ntot, a page height h, and an object height oh, you can use this calculation for the top position:
topy = n*(h – oh)/ntot
You can change an object's y position by writing the value into its geometricBounds array:
var myBounds = someFrame.geometricBounds;
myBounds = myBounds - myBounds + topy;
myBounds = topy;
someFrame.geometricBounds = myBounds;
As you can see, you have to read and write the array in one single piece. You need to change two elements: number  holds the top y position, number  holds the bottom y position. As you can see, you have to 'calculate' the bottom first, based on the top (A good alternative is using the move function but I can't write that from the top of my head.)
ok that's given me some clues.
Ill try and get my head around the move function as there will be several
hundred pages and that may alter.
so trying to avoid adjusting objects on every page before print.
if i understand you correct i could just insert the object at same place on
every page with code in its geometricBounds array then at end of production
I'll run the script?
sorry I should try it first. I'll start playing.
Cheers matey, nice response, ta