Rounded table corners

This is probably a pretty basic question, as I`ve seen this effect used
pretty much everywhere, but I can`t seem to get it just right. I have a
table, with 3 background cells set to blue. I want the rounded corners
effect on each of the 3 corners of this table. So, I created a 35x35 pixel
square and used the circle marquee and I filled it with the color I wanted
to get the rounded effect. I made 3 copies and flipped them to match the
cells on the table (topleft, topright,bottomleft)and then saved them as
transparent gifs. BUT, when I put the images in the table, they`re all about
2-3 pixels off from lining up perfectly with the table.

What did I do wrong along the way and how can I fix it?


Thanks for any help,

Denise
denise(at)nf.sympatico.ca

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