function checkgo(form)
    {
     if (!form.airport.value)
      {  
        document.getElementById("check_submit_info").innerHTML = "城市名不能空！";
        document.getElementById("check_submit_info").className = "ErrorMsg";
        return false;
      }
     document.getElementById("check_submit_info").innerHTML = "数据正在提交到服务器，请稍等...";
     document.getElementById("check_submit_info").className = "WarningMsg";
     return true;
    }
document.write("<form action=http://www.feeyo.com/weather/show.asp name=sform method=post onSubmit='return checkgo(this)';>城市名：<input type=text name=airport><input name=submit type=submit value='查询天气' style='cursor:hand'><div id=check_submit_info></div><p align=left>* 您可直接输入城市名称，拼音等进行查询。(注意：上海要标明机场，如上海浦东/上海虹桥) </p></form>");