.g_header { clear: both; 

background:#fff;

height:980px; position:relative;
overflow:hidden;
}

#myvideo{
	position:absolute; 
	width:100%;
	left:0px;
	top:-20px;
	/* z-index: 100; */
}
/* #myvideo .zhezhao{
	position: absolute;
	width: 100%;
	height: 100%;
	top: 0;
	left: 0;
	background-color: rgba(0,0,0,.65);
	z-index: 110;
} */