Nothing says that the oceans, if the earth even had oceans, were salty before the flood. Look at the earth as it is today: there's MAYBE 15% habitable land. 70% oceans, ginormous mountain ranges, expansive deserts, tundra, permafrost...do you think God created the earth the way it is now to be inhabited? (Is. 45:18)
I don't think the pre-flood earth was anything like it is today; for one thing, there is no way it could rain enough rain to cover Mt. Everest: there's no place for that water to go if the oceans already existed!
Ok, that's a little off-topic; if you want a good, plausible explanation, check out Dr. Hovind's seminar series and check out the tape called "The Hovind Theory."
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