Passing paramters between windows

Having spent hours trawling through books and help sites, i'm about to give
up - i hope someone here can help, and forgive me asking this.

I want to pass, and use, a value to an exiting  window.
I can open a new window, and i can open an exisiting window and pass some
information in - but then i lose the style and content of the window (that
is already there) -  although the address is the same as my original window,
i've lost what was there before i started.
I've seen ways to pass values to a target window and ways to grab values
from the source window (using a form) - but i cannot figure out how to do
what i want.

Which is:

My site has a number of thumbnail images, on various different pages.
When clicked on, i don;t want to just open up a new window to give the
full-size photo;
I want to open up my existing "SinglePhoto.htm"  window (which already has
my style, logo, structure defined) -
and add a new title (that is a parameter from my source window) , and insert
a named image  (that is also parameter from my source window).

i.e. I have a single-photo page with a template, which i want to use every
time my viewer opts to see a full-size image;
and into this template, I want to embed a named "image/myPhoto.jpg", and
give it a title and/or heading, also defined in the source window.

I've found lots of pieces to this jigsaw (but i'm not sure they're all from
the same picture) - but i cannot put them all together.

Many thanks for any help!

Hilma
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