/* 回到顶部 */
 #returnTop {
	-moz-border-radius:5px; -webkit-border-radius:5px; border-radius:5px;
	_display:none;
	position:fixed;
	_position:absolute;
	z-index:100;
	right:5px;
	bottom:-200px;
	_bottom:auto;
	width:36px;
	height:40px;
	text-indent:-999px;
	overflow:hidden;
	_background-color:#666666;
	background-color:#666666;
	background-image:url(Top.png);
	_background-image:url(Top.png);
	background-repeat:no-repeat;
	background-position:center;
	transition:bottom 0.9s;
	-webkit-transition:bottom 0.9s;
	-moz-transition:bottom 0.9s;
	-o-transition:bottom 0.9s;
filter: Alpha(opacity=55,style=0);/* IE 透明度50% */ 
-moz-opacity:0.55; /* Moz + FF 透明度50%*/ 
opacity:0.55;/* 支持CSS3的浏览器（FF 1.5也支持）透明度50%*/
cursor:pointer;
}
#returnTop:hover {
filter: Alpha(opacity=100,style=0);/* IE 透明度50% */ 
-moz-opacity:1; /* Moz + FF 透明度50%*/ 
opacity:1;/* 支持CSS3的浏览器（FF 1.5也支持）透明度50%*/
cursor:pointer;
}