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To reseal RV window the proper way, surf:
http://www.youtube.com/watch?v=Y3cotw1F8WwNote: Instead of using silicone for its outer "trimming", I would use Pro-Flex RV instead. Other than this minor change, the video is excellent.
If wondering, I resealed 11 of the RV windows on my 2006 Jayco and found 3 of them were leaking inside the walls. One was leaking really bad. Glad I fixed their leaks in time - before its inner sills / walls started to rot.
Hope this helps.