#classroom_menu_sign{ background:url(../Master/images/OnlineClassroom_images/onlineclassroom_menu_bg.gif) no-repeat; width:871px; margin:0 auto; padding:0 30px; height:41px; line-height:41px; color:#666;}
#classroom_menu_unsign{ background:url(../Master/images/OnlineClassroom_images/onlineclassroom_menu_bg_01.gif) no-repeat; width:871px; margin:0 auto; padding:0 30px; height:41px; line-height:41px; color:#666; font-weight:bold;}
#classroom_menu_sign img{ float:left; margin:13px 5px 0 0;}
* html #classroom_menu_unsign img{ margin:13px 5px 0 0;}
#classroom_menu_sign span{ color:#2b7400; font-weight:bold;}
#classroom_menu_sign a,#classroom_menu_unsign a{ color:#f03400; font-size:14px; font-weight:bold; text-decoration:underline;}
#classroom_menu_sign a:hover,#classroom_menu_unsign a:hover,#classroom_menu_unsign span a:hover{ text-decoration:none;}
#classroom_menu_unsign span a{ color:#2b7400; font-size:14px; font-weight:bold; text-decoration:underline;}
#classroom_left{ float:left; background:url(../Master/images/OnlineClassroom_images/left_bg.gif) no-repeat top; width:172px; padding-top:27px;}
#classroom_right{ float:left; background:url(../Master/images/OnlineClassroom_images/right_bg.gif) no-repeat top; width:761px; padding:27px 0 0 17px;}
#classroom_intro{ background:url(../Master/images/OnlineClassroom_images/introduction_bg.gif) no-repeat; height:50px; margin-bottom:15px; line-height:50px; text-align:center;}
#classroom_intro a{ color:#fff; font-size:24px; font-weight:bold; font-family:"Trebuchet MS"; text-decoration:none;}
#classroom_intro a:hover{ text-decoration:underline;}
#course_title{ background:url(../Master/images/OnlineClassroom_images/course_title_bg.gif) no-repeat; height:26px; line-height:26px; padding-left:15px; color:#fff; font-size:14px; font-weight:bold;}
#course_k{ border:#81de59 solid 1px; margin-bottom:15px;}
#course_menu{ height:25px; line-height:25px; padding-left:10px; border-bottom:#c2e8b7 solid 1px; background:#f0fbef;}
#course_menu img{ float:left; margin:9px 5px 0 0;}
#course_menu a{ color:#000; text-decoration:none;}
#course_menu a:hover{ text-decoration:underline;}
#course_menu span a{ color:#f03400; font-weight:bold; text-decoration:none;}
#course_menu span a:hover{ text-decoration:underline;}
#teacher_but{ margin-bottom:15px;}
#teacher_but img{ margin-bottom:10px;}
#support{ color:#666; font-size:14px; font-weight:bold; line-height:30px;}
#support span{ font-size:16px;}
#support img{ float:left; margin:5px 5px 0 0;}
#support a{ color:#666; font-size:14px; text-decoration:none;}
#support a:hover{ text-decoration:underline;}


#classroom_left_01{ float:left; width:172px; margin-top:27px;}
#classroom_right_01{ float:right; width:757px; margin-top:27px;}
#classroom_manager_posi{height:41px; line-height:41px; color:#f03400; font-size:16px; font-weight:bold; background:url(../Master/images/OnlineClassroom_images/posi_bg.gif) no-repeat;}
#classroom_manager_posi span{ color:#333;}
#classroom_manager_posi a{ color:#333; text-decoration:underline; margin:0 10px;}
#classroom_manager_posi a:hover{ text-decoration:none;}