E' javascript, lato client.
codice:
<form name="form1" method="post" action="./StampaProfilo.asp" target="centro"> 
<select name="profilo" onChange="document.form1.submit();"> 
<option value="">Seleziona</option>
<%do while not objrs.eof %> 
<option value="<%=objrs("id")%>"><%=objrs("titolo")+" "+objrs("nome")+" "+objrs("cognome")%></option> 
<%
objrs.movenext 
loop
%> 
</select>  
</form>