how to prevent users from accessing my download directly

[lindajames]

i need simple script that will check if the reffer is my domain and if so it would do a response.redirect to the download and if not then it would do a response.write with an error, can someone tell me how i can do this in ASP?

[JuniorHarris]

if request.servervariables("http_refer") = "http://www.domain.com/myrefer.html" then
response.redirect ("http://www.domain.com/mydownload.html")
else
response.write "Buffoon you can't get there from here"
response.end
end if

[Krapulator]

or this one which would let you refer from any page on your site:

if instr(request.ServerVariables("HTTP_REFERER"), "www.yourdomain.com") then
response.redirect ("http://www.yourdomain.com/mydownload.html")
else
response.write "Buffoon you can't get there from here"
response.end
end if