[R] help with levelplot()

[dxc13]

useR's,

I want to create a "movie" of a sin function (from 0 to pi/2) using
levelplot() in the lattice package.  I basically want to create 20 or so
plots of the sin function starting with an amplitude of 0 and ending at
amplitude 1.  By using a loop and plotting these in succession, it will have
the appearance of a movie or animation.  I believe I know how to do this
part, but I am having trouble working with the colors.
I want to use a range of colors starting with light blue (denoting zero) and
progressively getting darker as the amplitude gets closer to 1 (red color). 
Does anyone know a way to do this?

Thanks in advance
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