function showDlog(dg){
    $('contrl_bar').innerHTML = '<span class="dg '+dg+'" onmouseout="this.style.display=\'none\'" style="display:" \
    onmousemove="this.style.display=\'\'">\
    <span style="border-bottom:dashed 1px #ccc"><a href="" style="" class="sign18">首页</a></span>\
    <span style="border-bottom:dashed 1px #ccc"><a href="" style="" class="sign20">快乐学苑</a></span>\
    <span style="border-bottom:dashed 1px #ccc"><a href="" style="" class="sign21">教师园地</a></span>\
    <span style="border-bottom:dashed 1px #ccc"><a href="" style="" class="sign22">家长俱乐部</a></span>\
    <span style="border-bottom:dashed 1px #ccc"><a href="" style="" class="sign23">论坛</a></span>\
    <span style="border-bottom:dashed 1px #ccc"><a href="" style="" class="sign24">服务中心</a></span>\
    </span>\
    ';
}