function multiframe, x, N

Sz=size(x)

Nx=Sz(3)

m=(Nx-1)*N+1

y=make_array(sz(1),sz(2),m,type=Sz(Sz(0)+1))

	for j=0,m-2 do begin

in0=fix(j/N)
in1=fix(j/N+1)

w0=(j/float(N)-in0)

y(*,*,j)=x(*,*,in0)*(1-w0)+x(*,*,in1)*w0

	endfor

y(*,*,m-1)=x(*,*,Nx-1)

	return,y

	end