XML Transfer

Hello,
I am sending an xml doc from validateZip.asp using the following code:

Reg = "<ZipCodeRequest>" & vbCrLf
Reg = Reg & "<StoreName>" & storeName &
"</StoreName>" & vbCrLf
Reg = Reg & "<ZipCode>" & recipZipCode &
"</ZipCode>" & vbCrLf
Reg = Reg & "</ZipCodeRequest>" & vbCrLf
Set xml = Server.CreateObject("Microsoft.XMLHTTP")
xml.open "post",
"http://www.samedayshopping.com/sds/...asp", False
xml.setRequestHeader "Content-Type", "text/xml;
charset=utf-8"
xml.send Reg
RetVal = xml.responseText
Response.Write(RetVal)
Set xml = nothing

The receiving program ZipListener.asp parses the xml doc and uses a
Response.Redirect go to another URL. Here is the code:

newURL = "http://samedayshopping.com/comersus....asp"
Response.Redirect newURL

The problem is that the URL in the address field still shows
"http://www.samedayshopping.com/sds/...asp", and when I look
at the properties on the final page, it shows
"http://www.samedayshopping.com/sds/...asp". It should be
"http://www.samedayshopping.com/come...asp". My question is
why isn't it showing the correct URL?