._f_r {
    z-index: 1050;
    position: fixed;
    font-size: 12px;
    text-align: left;
    clear: both;
    border-radius: 5px;
    width: 300px;
    height: 200px;
    top: 100%;
    left: 100%;
    border: 3px solid #AAD9E8;
    background-color: white;
    /* IE6改为绝对定位，并通过css表达式根据滚动位置更改top的值 */
    _position: absolute;
    _top: expression(eval(document.documentElement.scrollTop) );
}

._f_r_title {
    height: 22px;
    border-bottom: 1px solid #AABBCC;
    text-align: center;
    line-height: 22px;
    font-weight: bolder;
    margin-bottom: 3px;
    background-color: #E8F2FE;
}

._f_r_btn {
    float: right;
    cursor: pointer;
    border: 1px;
}