图片环形3D效果

            //键盘
	var y=0;
	oBox.children[0].addEventListener('transitionend',function(){
		change(y);
	},false);
	
	var iSpeedY=0;
	var lastY=0;
	var timer=null;
	document.onmousedown=function(ev){
		clearInterval(timer);
		for(var i=0; i<oBox.children.length; i++){
			oBox.children[i].style.transition='none';
		}
		var disX=ev.clientX-y;
		
		document.onmousemove=function(ev){
			y=ev.clientX-disX;
			change(y/10);
			
			iSpeedY=y-lastY;
			lastY=y;
		};
		document.onmouseup=function(){
			document.onmousemove=null;
			document.onmouseup=null;
			
			timer=setInterval(function(){
				iSpeedY*=0.95;
				y+=iSpeedY;
				change(y/10);
			},30);
		};
		return false;
	};