Thanks to all who helped me solve this glitch. Nick got me going by
suggesting a few possibilities to address, seconded by Big John. It seems
that the problem was caused - at least in this case - because the images in
my thumbnail div didn't have height and width attributes called in either
the markup or the css. So FF kept re-adjusting to accommodate images of
unknown sizes. Each time it did that, the div would 'jump' to fit the img
and cause the 'flickering.'
The fix that I chose was to make each of the images the same size and define
them in my css. Once I did that, the images fell into place nicely and there
was no more flicker on my machine. Georg and Big John reported they were
still seeing it in earlier versions of FF and mozilla. Georg suggested that
adding
#wrapper {
display:table; } would isolate the scrolling element from the browser
window and further reduce any flickering caused by resizing. Since doing
that, it seems that particular problem has been fixed (for the time being?)
and I can putt his thread to bed.
Others on the list helped by testing the page on their boxes. Without all
your help I *might* have gotten this fixed, but I know I'd still be trying
to figure it out for quite some time and had somewhat less hair :-)
Cheers
Bill Scheider
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