document.write ("<select name=c_id sizs=1><option value=''>请选择实战类别</option>");
document.write ("<option value='11' class=bg_2");
if (cid==11) { document.write (" selected"); }
document.write (">使用说明</option>");
document.write ("<option value='12' class=bg_2");
if (cid==12) { document.write (" selected"); }
document.write (">新概念第二册</option>");
document.write ("<option value='13' class=bg_2");
if (cid==13) { document.write (" selected"); }
document.write (">新概念第三册</option>");
document.write ("</select><input type=hidden name=csnd value='no'>");