#mask {
	position:absolute;
	z-index:9999;
	background-color:#646464;
	left: 0;
    top: 0;
	height:1000%;
    width:100%;
	display :none;
	opacity:0.01;
}
 
#tip{
	color:red;
	text-align:center;
	float:center;
	line-height:250px;
}