Thanks guysfor the coments :D, I was going to put it up in colour till my pc died, it´s back now so I´llk be putting up the coloured version later. Ciao for now :).
Sedgemonkey- Thanks for the coment too, for the overlaping all I did was move the lines of the hills upa bit to give the afect, it´s quite easy.
What a great animation. Nice use of overlapping to create depth and the animation cycle is smooth.