Et langt script med fejl !!!!

Jeg har fået fat i det hersens script og jeg kan ikke rigtig få det til at virke.
Problemet opstår i INSERT INTO Sætningen (se kommentar i scriptet).
Jeg får ingen fejlmeddelse, men tilgengæld får jeg heller ikke lagt hverken productname eller productvhsdvd i databasen.

Nu har jeg siddet og rodet med det skide script i jeg ved ikke hvor lang tid, så jeg håber der er nogen som kan hjælpe.

Dette er hele scriptet:

<!-- #include file="dbforb.asp" -->
<%
' Get Product ID
productID = TRIM( Request( "pid" ) )


' Add Item to cart
IF productID <> "" THEN
  sqlString = "SELECT cart_id FROM cart " &_
    "WHERE cart_userID=" & userID & " " &_
    "AND cart_productID=" & productID
  SET RS = Conn.Execute( sqlString )

  IF RS.EOF THEN
  sqlString = "INSERT INTO cart ( " &_
    "cart_productname, " &_                    ' Virker ikke
    "cart_productvhsdvd, " &_                ' Virker ikke
    "cart_userID, " &_
    "cart_productID, " &_
    "cart_quantity " &_
    ") VALUES ( " &_
    "'" & productname & "', " &_
    "'" & productvhsdvd & "', " &_
    userID & ", " &_
    productID & ", 1 )"
  ELSE
  sqlString = "UPDATE cart SET " &_
    "cart_quantity=cart_quantity+1 " &_
    "WHERE cart_id=" & RS( "cart_id" )
  END IF
  RS.Close
  SET RS = Nothing
  Conn.Execute sqlString
END IF


' Update Shopping Cart Quantities
IF Request( "updateQ" ) <> "" THEN
SET RS = Server.CreateObject( "ADODB.Recordset" )
RS.ActiveConnection = Conn
RS.CursorType = adOpenDynamic
RS.LockType = adLockOptimistic
sqlString = "SELECT cart_id, cart_quantity FROM cart " &_
  "WHERE cart_userID=" & userID
RS.Open sqlString
WHILE NOT RS.EOF
newQ = TRIM( Request( "pq" & RS( "cart_id" ) ) )
IF newQ = "" OR newQ = "0" THEN
  RS.Delete
ELSE
  IF isNumeric( newQ ) THEN
    RS( "cart_quantity" ) = newQ
  END IF
END IF
RS.MoveNext
WEND
RS.Close
SET RS = Nothing
END IF
%>
<html>
<head><title>Indkøbskurv</title></head>
<body bgcolor="white">

<center>
<font face="Verdana" size=3 color="#000000">
<b><%=username%>'s indkøbskurv:</b>
</font>

<%
' Get the shopping cart
sqlString = "SELECT cart_id, product_name, " &_
  "product_price, cart_quantity, product_vhsdvd " &_
  "FROM cart, products " &_
  "WHERE cart_userID=" & userID & " " &_
  "AND cart_productID = product_id " &_
  "ORDER BY cart_id DESC"
SET RS = Conn.Execute( sqlString )

IF RS.EOF THEN
%>
<p><b>Du har ingen film i din indkøbskurv</b>
<p>
<form action="default.asp">
<input type="submit" value="Fortsætte">
</form>
<%
ELSE
orderTotal = 0
%>
<form method="post" action="viskurv.asp">
<input name="updateQ" type="hidden" value="1">
<input name="username" type="hidden" value="<%=username%>">
<input name="password" type="hidden" value="<%=password%>">
<table border=0 cellpadding=5 cellspacing=0 width="100%">
<tr bgcolor="#FF99CC">
  <th align="left">Film</th>
  <th align="left">VHS/DVD</th>
  <th align="left">Pris</th>
  <th>Antal</th>
</tr>
<%
WHILE NOT RS.EOF
orderTotal = orderTotal + ( RS( "product_price" ) * RS( "cart_quantity" ) )
orderTotalMoms = orderTotal - (orderTotal * 25)/100
%>
<tr>
  <td>
  <input type="text" name="product_name" value="<%=RS( "product_name" )%>">
  </td>
  <td>
  <input type="text" name="product_vhsdvd" value="<%=RS( "product_vhsdvd" )%>">
  </td>
  <td>
  <input type="text" name="product_price"value="kr.<%=RS( "product_price" )%>,-">
  </td>
  <td align="middle">
  <input name="pq<%=RS( "cart_id" )%>" type="text" size=4
  value="<%=RS( "cart_quantity" )%>">
  </td>
</tr>
<%
RS.MoveNext
WEND
%>
<tr bgcolor="#FF99CC">
  <td>&nbsp;</td>
  <td colspan=2 align=right>
  <b>Ordre Total:</b>
  </td>
  <td align="middle">
  kr.<%=( orderTotal )%>,-
  </td>
</tr>
<tr bgcolor="#FF99CC">
  <td>&nbsp;</td>
  <td colspan=2 align=right>
  <b>Eksl.moms:</b>
  </td>
  <td align="middle">
  kr.<%=( orderTotalMoms )%>,-
  </td>
</tr>
<tr>
  <td colspan=3 align="center">
  <table border=0>
  <tr>
    <td>
    <input type="submit" value="Opdater kurv">
    </td>
    </form>
    <form method="post" action="checkout.asp">
    <input name="username" type="hidden" value="<%=username%>">
    <input name="password" type="hidden" value="<%=password%>">
    <td>
    <input type="submit" value="Forsæt">
    </td>
    </form>
    <form action="default.asp">
    <td>
    <input type="submit" value="Købe flere film">
    </td>
    </form>
  </tr>
  </table>
  </td>
</tr>
</table>
<% END IF %>


</center>

</body>
</html>

På forhånd tak