Short version: can't get left-side navigation background to
repeat, though the content does. I'm not using frames, but am using
Longer version: About to mount my website, I changed my mind
at the last minute and decided not to use a scrollbar for long
pages, but just to show the whole page. I successfully used
"repeat" for the content background, but the same thing did not
work for the left-side navigation, for which I am using SSIs.
I, too, use SSIs in my websites, though none of them or the
pages have backgrounds. However, I think your problem with the
left-side nav is that (assuming it is contained in a table) there
is no content in the lower rows that stretch the table cell down.
One way to get around that is to create an empty row/cell and pop a
shim.gif in there. (Create one square pixel in PhotoShop and save
as shim.gif.) Then just adjust the width and height of the shim.
For instance, if you want your red background to go another 300
pixels down, make your shim.gif 1 pixel wide by 300 high.
I find shims incredibly useful for creating vertical lines,
adding space above or below lines of text, etc.