Actually, I can see horizontal lines running through the gradient, too. Might be attributable to "over optimization."
When I view the image, by itself, it looks like the gradient is applied at a slight angle. (http://www.jontakiff.com/Images/headness1.jpg) The reason you might see the edges meeting is that the gradient shading of the top image isn't an exact match as that on bottom, due to this angle -- one side is a little darker than the other, thus when they meet, it's not a smooth transition.
KDLA
FYI
* My screen resolution is set at 1680x1050
* I'm accessing your site through a T1 line
* I'm probably viewing it using Firefox (unless browser is specified)
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