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OpenGL Problem with clipping planes

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Hello!!! I was implementing texture projection for a spot light. but an other projected texture also appears. this is mathematic logical. And i try to clip the place behind the spotlight at the second pass( the pass i draw the scene using the projected texture). I use OpenGL clip planes well.. it works!!! but i get some artifacts. like z-fighting while camera moves. any idea what is going on? this is a part of my code: http://rafb.net/paste/results/4CQSKq94.html thanks in advance

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often with gl clipplanes than geometry gets callulated differently (goes down a different path) thus the same vertex might be rendered at (1.00001,0,0) with clipplanes off but 0.99999,0,0 with clipplanes on (hence the zfighting)
use polygonoffset

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