Don't use towels - 1) they suck up more moisture than they give off, and 2) they harbor bacteria like mad.
The best way to keep good humidity in a tank is to cover the screen top with either plexiglass fitted to the top, or with the foil treatment. These are the two best methods that get good steady results.
I have a picture tutorial on treating a screen with foil and can PM it to anyone who asks.
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