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<title>弹出下拉菜单插件弹出层相对于自身的父层 </title>
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#lr_systembox{ width:980px; height:50px; background-color:#CCC; position:relative; margin:0 auto; z-index:100000;}
.lr_systembtn{ width:201px; height:35px; line-height:33px;position:absolute; top:0px; right:0px; z-index:100004;}
.lr_systembtn .lr_abtn{ width:100%; height:35px; display:block; font-size:15px; font-weight:bold;color:#666666;
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.lr_systembtn .lr_abtn span{ padding-left:28px;}
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position:absolute; top:35px; right:0px; z-index:100005;display:none;}
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