.auto_hidden {  
    width:204px;  
    border-top: 1px solid #333;  
    border-bottom: 1px solid #333;  
    border-left: 1px solid #333;  
    border-right: 1px solid #333;  
    position:absolute;  
    display:none;  
}  
.auto_show {  
    width:204px;  
    border-top: 1px solid #333;  
    border-bottom: 1px solid #333;  
    border-left: 1px solid #333;  
    border-right: 1px solid #333;  
    position:absolute;  
    z-index:9999; /* 保证页面在最前端*/  
    display:block;  
    height:100px;  
    overflow:auto ;
    font-size:13px;
    text-align: left;
}  
.auto_onmouseover{  
    color:#ffffff;  
    background-color:highlight;  
    width:100%;  
    font-size:13px;
    text-align: left;
}  
.auto_onmouseout{  
    color:#000000;  
    width:100%;  
    background-color:#ffffff; 
    font-size:13px;
    text-align: left;
}