Checking Email In Database Already

I currently setup a form for a survey which works fine and all the information that is gathered is stored in an access 2000 database.

The thing i want to do is to only let the person fill out the form using only 1 email address. So if they try to come back and fill out the form again using the same email address, i want there to be a check on the database to see if the email is there. If it is the form wont submit and it will let the person know. If it's not in the database things will work as planned.

this is what i have so far, but when i submit the form it continues on, but it doesnt check and doesnt email or add to the database like it used too...

Code:<%Dim DSNtemp, Conn, SQLDSNtemp = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=DATABASE LOCATION"Set Conn = server.createobject("adodb.connection")Conn.Open DSNtempemail = Request.Form("email")SQL = "Select * From users Where email = '" & email & "'"Set RS = Conn.Execute(SQL)'HERE WE CHECK TO MAKE SURE THE USERS EMAIL EXISTS, IF IT DOES, WE STOP HEREIf NOT RS.EOF Thenx = "Sorry The Email Address You Entered Already Exist!"Set RS = NothingConn.CloseSet Conn = NOTHINGElse'CONTIUES ON WITH DATBASE INSERTION AND EMAIL TO USER.End If%>