If Request( "Submit" )<>"" Then
Dim content,num
content=Trim( Request("content") )
If len( content )>500 Then
response.write "<SCRIPT language=JavaScript>alert('留言内容超出500字！');"
response.write "this.location.href='vbscript:history.back()';</SCRIPT>"
response.end
End If

End If
看下前3句好吗

哪有少啊
只是不明白前面那些的意思.....

问题解决!
谢谢!!