asp判断上传的是否是图片问题，在线等求高手

悬赏园豆：10 [已解决问题] 解决于 2013-02-04 14:07

oldfilename =replace(replace(replace(replace(cstr(now())," ",""),"-",""),":",""),"/","") &"_"&file.FileName '获取上传文件的名字

lname=oldfilename
la=split(lname,"/")
num=ubound(la)
lb=split(la(num),".")
num2=ubound(lb)
'response.Write("."&lb(num2))
typed="."&lb(num2)
response.Write(typed) '这里能正常输出文件名后缀如 .jif .asp 等

'下边我的判断有问题吗，为啥出错呢
if typed!="jpg" || "gif" then

%>

    <script>
  alert("只能上传jpg或者gif格式图片");
  history.back(1);
</script>

    <%

   else

　　......

asp