Thin horizontal distorting lines on top and bottom of screen

Hi,
I've got a g3 imac (600mhz Snow, 10.2), it's a friends actually, he brought it over to see if I could help him out. It apparently came on gradually, but now, the top and bottom of the screen is obliterated by horizontal lines, rapidly oscillating, side to side. I'm going to try an external monitor later in the week, but I was wondering if anyone had any ideas. The lines at the very top calm down after ten minutes or so, but the dock at the bottom of the screen is completely distorted, it's only the middle third of the screen that remains only slightly jittery.
ANy help, as ever, would be greatly appreciated.
Cheers,
Kev.
Mac OS X (10.4.7) g3 imac 500; g4 ibook 800; g5 imac 1.8

Sounds like a hardware problem. Attaching the external display will show if the problem is in the CRT itself, or in the analog video hardware. Since the problem gradually because worse over time, it doubt that it is related to software. Trying the PRAM battery replacement was a good idea, even if it wasn't the problem. If you haven't done it, you can do a reset of PRAM during startup.
http://docs.info.apple.com/article.html?artnum=2238
However, I think it's either the CRT or the analog video hardware going bad.

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Thin horizontal distorting lines on top and bottom of screen

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