请问如题/*栏目布局样式*/
.lanmu_box{clear:both;margin:5px 0 0 0;overflow:hidden;}
.lanmu_box_style1{clear:both;margin:5px 0 0 0;overflow:hidden;}
.lanmu_box_style1_left{float:left;width:200px;margin:0 10px 0 0;overflow:hidden;text-align:left;}
.lanmu_box_style1_right{float:right;width:770px;margin:0 0 0 0;overflow:hidden;text-align:left;}
.lanmu_box_style2{clear:both;margin:5px 0 0 0;overflow:hidden;}
.lanmu_box_style2_left{float:left;width:770px;margin:0 10px 0 0;overflow:hidden;text-align:left;}
.lanmu_box_style2_right{float:right;width:200px;margin:0 0 0 0;overflow:hidden;text-align:left;}
.lanmu_box_style3{clear:both;margin:5px 0 0 0;overflow:hidden;}
.lanmu_box_style3_left{float:left;width:220px;margin:0 10px 0 0;overflow:hidden;text-align:left;}
.lanmu_box_style3_middle{float:left;width:540px;margin:0 0 0 0;overflow:hidden;text-align:left;}
.lanmu_box_style3_right{float:right;width:220px;margin:0 0 0 10px;overflow:hidden;text-align:left;}
