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请问旧版的系统为什么不能安装现在的风格呢？旧版本安装现在的风格后栏目导航变型：
以下是旧版风格css的代码：
/*栏目导航样式*/
.lanmu_menu_box{clear:both;width:100%;padding:0 0 0 0;margin:0 0 5px 5px;border:0 solid #cccccc}
.lanmu_menu_title{margin:0 0 0 0;border:0 solid #cccccc;height:25px;Text-align:left;border:0 solid #C8B6B6;border-
width:0 0 1px 0}
.lanmu_menu_content{margin:0 0 0 0;padding:5px 5px 5px 5px;border:0 solid #cccccc;Text-align:left;}
.lanmu_menu_list{height:20px;Text-align:left;border:0 solid #cccccc;padding:5px 5px 0 15px;margin:2px 0 5px
0;overflow:hidden;background-colorEBEBEB}
.lanmu_sub_menu_list{height:22px;Text-align:left;padding:0 5px 0 38px;background:url(images/lanmu_sub_menu_bg.gif)  
no-repeat 20px 0;}

.lanmu_article_list_1{height:25px;text-align:left;border:0 dotted #cccccc;border-width:0 0 0 0;}
.lanmu_article_list_2{Text-align:center;border:0 solid #cccccc;margin:5px 0 0 0;}
.lanmu_article_2_image{width:150px;margin:5px 5px 5px 0;border:1px solid #dddddd;}
.lanmu_menu_sign{float:left;Text-align:left;padding:5px 0 0 10px;font-weight:bold;color963F38}
.more{float:right;font-weight:normal;padding:7px 10px 0 10px;margin:0 0 0 0;background:url(public/more_icon.gif) no
-repeat 0 12px;}
a.amore{font-family:Arial;line-height:15px;height:20px;font-size:10px;}

新版的：
/*栏目导航样式*/
.lanmu_nav_box{clear:both;width:100%;margin:0 0 10px 0;overflow:hidden;}
.lanmu_nav_sign{font:14px/normal "Microsoft YaHei", "Microsoft JhengHei", "Arial";float:left;text-align:left;padding:5px 0 0 22px;}
.nav_more{float:right;font-weight:normal;paddingpx 10px 0 10px;margin:0 0 0 0;background:url(public/more_icon.gif) no-repeat 0 13px;}
.lanmu_nav_title{font-weight:bold;border:0 solid #cccccc;border-width:0 0 0px 0;height:28px;text-align:left;overflow:hidden;background:url(images/nav_title_sign.gif) no-repeat 0px 0px;}
.lanmu_nav_header{text-align:left;padding:0 0 0 0;margin:0 0 0 0}
.lanmu_nav_content{margin:0 0 0 0;padding:5px 5px 5px 5px;border:0px solid #e1e1e1;text-align:left;background:url(images/lanmu_nav_menu.gif);border-width:1px 0 1px 0;}
.lanmu_nav_menu{margin:0 0 0 0;padding:5px 5px 5px 0;border:0px solid #E1E1e1;text-align:left;background:url(images/lanmu_nav_menu.gif);border-width:0 0 1px 0;}
.lanmu_nav_menu_list{height:29px;text-align:left;border:0 solid #cccccc;padding:5px 5px 0 45px;margin:2px 0 5px 0;overflow:hidden;background:url(images/bg_left.gif) no-repeat 0 0;}
.lanmu_nav_submenu_list{line-height:29px;text-align:left;padding:0 5px 0 50px;background:url(images/lanmu_nav_submenu_bg.gif)  no-repeat 32px 3px;}
a.lanmu_nav_menu_href{line-height:20px;line-width:220px;text-align:left;}
a.lanmu_nav_submenu_href{color888888;line-height:20px;text-align:left;}
.lanmu_nav_article{margin:0 0 0 0;padding:5px 5px 5px 5px;border:0px solid #cccccc;text-align:left;overflow:hidden;}
.lanmu_nav_article_list_1{text-align:left;border:0 dotted #cccccc;border-width:0 0 0 0;padding:5px 0 0 12px;background:url(images/article_arrow.gif)  no-repeat 5px 14px;}
.lanmu_nav_article_list_2{text-align:center;border:0 solid #cccccc;margin:5px 0 5px 0;}
.lanmu_nav_article_2_image{margin:0 5px 5px 0;border:1px solid #dddddd;}
a.lanmu_nav_article_href{text-align:left;line-height:20px;}

请高手帮忙结合一下 ，谢谢！