jQuery(function(){
	  jQuery('.screen')
	    .sprite_layer({num_sprites: 5, xspeed: -10})
	    .sprite_layer({num_sprites: 5, xspeed: -20})
	    .sprite_layer({num_sprites: 2, xspeed: -30})
	    .sprite_layer({num_sprites: 1, xspeed: -40, sprite_class:'turtle'})
	    .sprite_layer({num_sprites: 1, xspeed: -75, sprite_class:'bullet'})
	    .sprite_layer({
	        num_sprites: 1, 
	        xspeed: 75, 
	        yspeed: -100, 
	        sprite_class:'mario-raccoon'
	    });
	});