Update/mysql

<%
Set conn = server.createobject("adodb.connection")
conn.open "Driver={MySQL ODBC 3.51 Driver};Server=localhost;Database=brugere;uid=;pwd=;"
SET rs = server.createobject("adodb.recordset")
SQL="update brugere set rs("antalposts")=rs("antalposts")+1 where bruger=kasper"
conn.execute(sql)
conn.close
set conn = nothing
%>

Det her virker ik i mysql why?????