var sx = 0;
	var sy = 0;
	var sxs = 0;

	function cube(){
		$("div.cube").css("-moz-transform","skew("+sx+"deg,"+sy+"deg)");
		$("div.cube").css("-webkit-transform","skew("+sx+"deg,"+sy+"deg)");
		sp = Math.floor( Math.random() * 16);
		if(sxs == 0){
			sx -= sp;
			sy += sp;
		}else{
			sx += sp;
			sy -= sp;
		}
		
		//0と1を反転させる
		if(sx > 270){
			sxs = Math.abs(sxs-1);
		}else if(sx < -270){
			sxs = Math.abs(sxs-1);
		}	
	}
$(function(){
	timerID = setInterval(cube,100);
});