The default size for the tile_back.gif is 11 x 30 pixels. I've been wrestling with it, because my tile_back.gif is a gradient and depending on where it shows up (side boxes, center boxes, nav div), it gets truncated - the sideboxes cut it off at 22 pixels high, for example.
I made my custom gradient using Paint Shop Pro. When I realized I needed another tile_back.gif for my navigation divider because I have two rows of categories, I needed to make it 50 pixels high. Sideboxes cut that tile_back.gif off at 22 pixels.
Paint Shop gradients are done to scale, so the "steps" of the gradient are more pixels deep on a 50 pixel high image than on one that is 30 pixels high. So what I had to do is make the standard 30 pixel high .gif, and then cut and paste the gradient (top and bottom) onto taller or shorter versions, so the actual gradient stays the same size.
So, it takes a series of at least three tile_back.gifs, like this:
And then of course you have to put them in your stylesheet.css at the appropriate places, and play with the width of your navigation divider. But... it solves the problem of having dividers that all look slightly different depending on their size.
TA DAH!
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