how do I get rid of a jagged edge on a a curve?

I have a grey curved area in one layer on a white
background in another layer.
But the edge is very jagged.
How can i get rid of this jaggedness?
It's completely unuseable .
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astollerAuthor Commented:
BTW here's the link.
Its layered.You can see the lower 2 grey curves are bad.
You did it as a GIF which has far too few colors for that image. Re-export the image as a JPEG or PNG and it should be fine.
weedCommented: it from the original photoshop file, not from that GIF.
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send me psd file with dimension (width/height) & i will fix it for u

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Trans. That doesn't help people looking at this question later.
astollerAuthor Commented:
Actually I solved the problem by selecting the preserve
transparency option.
Then refilling the selected area
Thanks for the suggestions.
Wait, why did you accept an answer that wasnt useful?
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