Javascr ipt带图片的下拉导航菜单实例，当鼠标移过图片的时候，展现出对应的二级菜单，移开则消失，图片是随便找的，请根据自己的需要重新制作。-Javascr ipt drop-down navigation menu with pictures of examples, when the mouse over the image when the two show the corresponding menu, remove the disappeared, the picture is