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If these lines are faint and only 1px high, around the edges of the images/slices they are probably due to anti-aliasing in Photoshop. I find that if I copy a selection of a page design I've made in Photoshop that I want to be a seperate image, and then paste into a new document the exact same size, Photoshop slightly anti-aliases the edges of my selection so that the pasted image has slightly transparent edges. If I save this out as a .gif or .jpg the artwork is flattened, by default onto a white background, and hence the white lines.
The solution is simple however - when you paste the image into the new document, just repeat this several more times (3 is usually enough) and the overlaid images will become 100% opaque. If you've already pasted the image, and assuming you haven't flattened the artwork, just duplicate the layer a few times and then remerge. If you've flattened the image already your best bet is to start over.
PS: If any of the images you have taken from the layout page are selected/cropped from the edge of a block of strong contrasting colour you are also likely to end up with an edge - the best bet is to always pull the selection in a pixel (or oversize the image a pixel or two) to give a bit of bleed.
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