#left_menu {
	margin: 0;
	padding: 0;
	position: fixed; 
	top: 200px; 
	left: 0px;
	z-index: 900000000;
	_position: absolute;/*兼容IE6*/
	/*_top: expression(offsetParent.scrollTop+document.documentElement.clientHeight-this.offsetHeight);始终位于底部*/
	_top: expression(documentElement.scrollTop+200);
	border: 1px solid white;
}
/*兼容IE6*/

/*html {
	background-image: url(about:blank);
	background-attachment: fixed;
}*/
body {
	padding-left: 26px;/*给左侧边栏留下足够的空间*/
}
.left_menu_title {
	background: url('./Images~/menu_light.png') no-repeat center center;
	border-bottom-right-radius: 10px;
	border-top-right-radius: 10px;
	width: 16px; 
	height: 200px; 
	text-align: center;
	display: block; 
	float: left;
	margin: 0;
	padding: 0;
	cursor: pointer;
	color: #FFF; 
}
.left_menu_content {
	width: 0px; 
	height: 200px;
	float: left;
	background-color: #555;
	overflow-y: scroll; 
	display: none;
}
.left_menu_content p {
	text-indent: 0;
}
.left_menu_title span {
	width: 26px;
	text-indent: 0;
	position: relative; 
	top: 50%;
	display: block;
	z-index: 910000000;
}
.left_menu_expand {
	/*background-color: gray;*/
}
.left_menu_content a {
	padding: 0.5em;
}