CSS 实现鼠标指向切换背景图片

	<a href="/go.html?url=#" class="blue_box" target="_self"><ul class="blue_box" style="margin: 50px 0px 0px 530px;">
		<li><b>页头顶部导航</b></li>
		<li><span>点击量：</span> <span><%=map.get(AreaEnum.YTDBDH.getAreaname()).getHits() %></span>
		</li>
		<li><span>占比：</span> <span><%=map.get(AreaEnum.YTDBDH.getAreaname()).getContentof()%>%</span>
		</li>
		<li><span>较上月同比：</span><span><%=map.get(AreaEnum.YTDBDH.getAreaname()).getH_28r()%>%</span>
		</li>
	</ul></a>	<a href="/go.html?url=#" class="blue_box" targ