$(function(){
	var iconH = $(".sprite").find("s").height(),
		triggerLi = $(".sprite").children("li");
	//console.log(iconH);
	triggerLi.each(function(){
		var $this = $(this),
			$index = $this.index();
		//console.log($index)

		//console.log(iconH*$index);

$this.children("s").css("background-position","0 -"+ iconH*$index +"px")

$this.hover(function(){
  // 鼠标移入
  $this.children("s").css("background-position","-24px -"+ iconH*$index +"px")
},function(){
  // 鼠标移出
  $this.children("s").css("background-position","0 -"+ iconH*$index +"px")
})
	})
})