White border lines after live trace

Hi,
I'm new with Illustrator and I'm finding it difficult to navigate after Photoshop.
Basically I have a photo which I have live traced. I did it in colour so it looks like a painting. Thats what I want to end up with and will likely only be viewing it on my computer. In Illustrator it looks fine, just how I want it. But when I save it as a .ai file and then view it in something like Preview (on the Mac) it comes up with a thin white border between almost every colour.
I searched this forum and the net prior to posting this but I cannot seem to solve the issue. I have read things about transparency but in my case there shouldn't be any gaps, should there? I just live traced the photo.
If you can help me with please phrase it in simple terms. I'm only just starting out here....
Thanks!
Mellfee

Hi Monika,
Thanks for helping me out here. I really appreciate it. I do have some further questioning though if you wouldn't mind. I'm just trying to understand what's happening.
In Illustrator, I can zoom in and in and in to these lovely vector graphics and not see any white lines between the shades/colours. So how come when I view the saved file in Preview at half the size I see the lines?
I followed your suggestion and rasterized it and the lines don't appear. I haver to admit I'm a bit disappointed however as I really wanted the smooth vector drawings. If ultimately that is the effect I want to get, and I want to avoid the white lines due the pictures being displayed mainly on my computer, what advice might you give me to get there?
Very much appreciated,
Mellfee

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