/*=============第一页=============*/	
.header{
	margin:0 auto;
	width:100%;
	height:270px;
	position:relative;
	}
.header canvas {
	width:100%;
	height:auto/*默认全屏显示 可自己设置高度640px*/;
	display:inline-block;
	vertical-align:baseline;
	position:absolute;
	z-index:-1;
	}
.header .canvaszz{  /*用来解决视频右键菜单，用于视频上面的遮罩层*/
	width:100%;
	background-image: url(imgin_top_bj2.jpg);
	height:270px;
	position:absolute;
	z-index:10;
		filter:alpha(opacity=40);  
      	-moz-opacity:0.4;  
      	-khtml-opacity: 0.4;  
      	opacity: 0.4;
	}