*{
		margin:0;
		padding:0;
	}
	
	.alert_windows{
		display:none;
		position:fixed;
		z-index:10;
		width:500px;
		height:550px;
		background:#f4f356;
        #background:url(kf.png) no-repeat;
	}
	.cgonggao{
	margin:5px 25px;

	}
	
	.alert_windows span{
		float:right;
		width:60px;
		height:35px;
		text-align:center;
		font:20px/35px Microsoft Yahei;
		cursor:pointer;
		color:#333;
		background:#e90506;
	}
		.alert_windows gonggao{
		float:left;
		width:100%;
		height:500px;
		text-align:left;
		font:15px/30px Microsoft Yahei;
		cursor:pointer;
		color:#333;
		#background:lightblue;
	}
	.alert_windows span:hover{
		color:#EEE;
		background:red;
	}