document.write ("<select name=c_id sizs=1><option value=''>请选择文栏类别</option>");
document.write ("<option value='3' class=bg_2");
if (cid==3) { document.write (" selected"); }
document.write (">泥鳅养殖</option>");
document.write ("<option value='3&s_id=1'");
if (sid==1) { document.write (" selected"); }
document.write (">　泥鳅养殖</option>");
document.write ("<option value='3&s_id=2'");
if (sid==2) { document.write (" selected"); }
document.write (">　种苗技术</option>");
document.write ("<option value='3&s_id=3'");
if (sid==3) { document.write (" selected"); }
document.write (">　泥鳅捕捞</option>");
document.write ("<option value='3&s_id=4'");
if (sid==4) { document.write (" selected"); }
document.write (">　疾病防治</option>");
document.write ("</select><input type=hidden name=csnd value='yes'>");