one pixel line in background

[skizo]

hi, i've got a simple image as my background (one color + some lines over it)... the only thing is that when people are surfing my site in an other resolution (let's say 1600x1200), my background image becomes showed in mosaic (and that's good), but there's a one pixel line appearing between each image of the mosaic, how can i resolve that?
thx!

[Twey]

You probably have the line in the image. Crop it off.

[skizo]

no, i already checked the image about 4 times, during 20 minutes each time. i'm sure it's not my image. i worked it in illustrator at 1200% to be sure of every thing...

[skizo]

well, sorry twey, you got it right... i rechecked it in PS, and there was a one pixel line at the top... seems like illustrator wasn't showing it for what so ever reason...
thx for making me recheck it a zillion time.... ;)