// Left JavaScript Document
document.writeln("<div id='dl_left' style='position:absolute;left:6px;top:100px;'>");
document.writeln("<a href=http://c.koolearn.com/subject/stdj/ target=_blank>");
document.writeln("<img id='dl_left1' src='http://images.koolearn.com/www/cooperation/library/2011/111221s.gif' width='20' height='300' onmouseover=\"document.getElementById(\'dl_left1\').style.display=\'none\';document.getElementById(\'dl_left2\').style.display=\'block\';\">");
document.writeln("<img id=\"dl_left2\"  style=\"display:none;\" src='http://images.koolearn.com/www/cooperation/library/2011/111221b.gif' width=100 height=300 onmouseout=\"document.getElementById(\'dl_left1\').style.display=\'block\';document.getElementById(\'dl_left2\').style.display=\'none\';\">");
document.writeln("<\/a>");
document.writeln("<div style=\"cursor:pointer;background:#eeeeee;font-size:12px;text-align:center;\" onClick=\"document.getElementById(\'dl_left\').style.visibility=\'hidden\';document.getElementById(\'dl_right\').style.visibility=\'hidden\';\">关<\/div>");
document.writeln("<\/div>")