jQuery简单实现网页选项卡特效

CSS： 代码如下:         .clear{clear:both; height:0px; overflow:hidden;}         .tab{width:400px; font-size:12px;}         .tab_menu ul{padding:0px;margin:0px;}         .tab_menu li{list-style:none; display:block; float:left;             background:#C2CEFE; height:22px; line-height:22px;