please help update sql

Hi i am trying to build an updatable profile area for members

but am getting


Microsoft VBScript runtime error '800a01a8'

Object required: '[string: "utown"]'

/myspace/edit_userloc.asp, line 31

when i run this bit of code :

username = Request.cookies("isLoggedInAs")("username")

town = cstr(Request.form("utown"))
postcode = cstr(Request.form("upostcode"))
alerts = cstr(Request.form("alerts"))

set racDB = Server.CreateObject("ADODB.Connection")
racDB.Open "rac"


set insertset = Server.CreateObject("ADODB.RecordSet")
insertset.Open "memb_loc", racdb, _
adOpenstatic, adCmdTable

if p_existing = "" then
insertset.AddNew
else

updateset.Find "username =" &p_existing

end if

set town = "utown"
set postcode = upostcode
set("alerts") = alerts

updateset.Update
updateset.Close
set insertset = Nothing

racDB.Close
set racDB = Nothing

Response.Clear

this is the form action i am using

<FORM ACTION="edit_userloc.asp" METHOD = "post">
<TABLE>
Town: <INPUT TYPE="text" NAME="utown" size = "30"
VALUE="<%=town%>"><BR>
Postcode: <INPUT TYPE="text" NAME="upostcode" size = "8"
VALUE="<%=postcode%>"><BR>

<div align="left">Send me

<select name="distance" size="1">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
<option value="6">6</option>
<option value="7" selected>7</option>
<option value="8">8</option>
<option value="9">9</option>
<option value="10">10</option>
</select>


text alerts per week</div>

</TABLE>
<Input TYPE="submit" value = "Update">
</FORM>


please help

steve