.pic_left{
    float: left; 
    margin-top: 5px;
    margin-right: 6px;
}
.pic_right{
    float: right; 
    margin-top: 5px;
    margin-left: 6px;
}
.pic_top{
    margin-bottom: 8px;
}
.pic_down{
    margin-top: 8px;
}