ASP 验证码图片成XX

帮朋友改个ASP网站
对ASP可谓是一点都不熟

但代码嘛，都差不多，就是细节的差别罢了
进入正题

原本他网站部署到外网是正常的
可是我从FTP上down下来后
在IIS7下部署好了,打开网站是正常的，就是登陆后台的验证码的图片成了XX

贴下验证码的code，各位ASP大侠们帮帮忙看看，是哪里出问题了哈

<%

Option Explicit

Response.buffer=true

NumCode

Function NumCode()

	Response.Expires = -1

	Response.AddHeader "Pragma","no-cache"

	Response.AddHeader "cache-ctrol","no-cache"

	On Error Resume Next

	Dim zNum,i,j

	Dim Ados,Ados1

	Randomize timer

	zNum = cint(8999*Rnd+1000)

	Session("CheckCode") = zNum

	Dim zimg(4),NStr

	NStr=cstr(zNum)

	For i=0 To 3

		zimg(i)=cint(mid(NStr,i+1,1))

	Next

	Dim Pos

	Set Ados=Server.CreateObject("Adodb.Stream")

	Ados.Mode=3

	Ados.Type=1

	Ados.Open

	Set Ados1=Server.CreateObject("Adodb.Stream")

	Ados1.Mode=3

	Ados1.Type=1

	Ados1.Open

	Ados.LoadFromFile(Server.mappath("../image/body.Fix"))

	Ados1.write Ados.read(1280)

	For i=0 To 3

		Ados.Position=(9-zimg(i))*320

		Ados1.Position=i*320

		Ados1.write ados.read(320)

	Next	

	Ados.LoadFromFile(Server.mappath("../image/head.fix"))

	Pos=lenb(Ados.read())

	Ados.Position=Pos

	For i=0 To 9 Step 1

		For j=0 To 3

			Ados1.Position=i*32+j*320

			Ados.Position=Pos+30*j+i*120

			Ados.write ados1.read(30)

		Next

	Next

	Response.ContentType = "image/BMP"

	Ados.Position=0

	Response.BinaryWrite Ados.read()

	Ados.Close:set Ados=nothing

	Ados1.Close:set Ados1=nothing

	If Err Then Session("CheckCode") = 9999

End Function

%>