求助，一个 asp 判断表单程序，为空不能提交的限制！

sname=changechr(request("name"))
stel=RtnReplaceInt(request("tel"),0)
sex=changechr(request("sex"))
email=changechr(request("email"))
fy_infotype=changechr(request("fy_infotype"))

yzwt=lcase(request.form("yzwt"))

if sname="" then
response.write"<SCRIPT language=JavaScript>alert('name不能为空！');"
response.write"javascript:history.go(-1) ;</SCRIPT>"
response.end
end if

if stel="" then
response.write"<SCRIPT language=JavaScript>alert('tel不能为空！');"
response.write"javascript:history.go(-1) ;</SCRIPT>"
response.end
end if

'if yzwt<>lcase(webname) then
'response.write"<SCRIPT language=JavaScript>alert('验证问题出错！');"
'response.write"javascript:history.go(-1) ;</SCRIPT>"
'response.end

[ 本帖最后由 kingfangden 于 2014-11-14 21:16 编辑 ]