Sommare campi input

[morangel]

Buonasera, vorrei fare in modo che la parte Totale di questa tabella mi facesse la somma dei tre campi input: esempio se prezzounit è 10, prezzounit2 è 20 e prezzounit3 è 30 nella casella totale facesse la somma cioè 60, questo man mano che inserisco i vari prezzi.
posto il codice della pagina.

<%@LANGUAGE="VBSCRIPT"%>
<!--#include file="Connections/miositoWeb.asp" -->
<%
Dim MM_editAction
MM_editAction = CStr(Request.ServerVariables("SCRIPT_NAME"))
If (Request.QueryString <> "") Then
  MM_editAction = MM_editAction & "?" & Server.HTMLEncode(Request.QueryString)
End If
' boolean to abort record edit
Dim MM_abortEdit
MM_abortEdit = false
%>
<%
' IIf implementation
Function MM_IIf(condition, ifTrue, ifFalse)
  If condition = "" Then
    MM_IIf = ifFalse
  Else
    MM_IIf = ifTrue
  End If
End Function
%>
<%
If (CStr(Request("MM_insert")) = "form2") Then
  If (Not MM_abortEdit) Then
    ' execute the insert
    Dim MM_editCmd
    Set MM_editCmd = Server.CreateObject ("ADODB.Command")
    MM_editCmd.ActiveConnection = MM_CarboniaWeb_STRING
    MM_editCmd.CommandText = "INSERT INTO dbo.dbBuono (IdBuono, UnitaMisura, UnitaMisura2, UnitaMisura3, prezzoUnit, prezzoUnit2, prezzoUnit3, Totale) VALUES (?, ?, ?, ?, ?, ?, ?, ?)" 
    MM_editCmd.Prepared = true
    MM_editCmd.Parameters.Append MM_editCmd.CreateParameter("param1", 5, 1, -1, MM_IIF(Request.Form("IdBuono"), Request.Form("IdBuono"), null)) ' adDouble
    MM_editCmd.Parameters.Append MM_editCmd.CreateParameter("param2", 201, 1, 10, Request.Form("UnitaMisura")) ' adLongVarChar
    MM_editCmd.Parameters.Append MM_editCmd.CreateParameter("param3", 201, 1, 10, Request.Form("UnitaMisura2")) ' adLongVarChar
    MM_editCmd.Parameters.Append MM_editCmd.CreateParameter("param4", 201, 1, 10, Request.Form("UnitaMisura3")) ' adLongVarChar
    MM_editCmd.Parameters.Append MM_editCmd.CreateParameter("param5", 202, 1, 50, Request.Form("prezzoUnit")) ' adVarWChar
    MM_editCmd.Parameters.Append MM_editCmd.CreateParameter("param6", 202, 1, 50, Request.Form("prezzoUnit2")) ' adVarWChar
    MM_editCmd.Parameters.Append MM_editCmd.CreateParameter("param7", 202, 1, 50, Request.Form("prezzoUnit3")) ' adVarWChar
    MM_editCmd.Parameters.Append MM_editCmd.CreateParameter("param8", 202, 1, 50, Request.Form("Totale")) ' adVarWChar
    MM_editCmd.Execute
    MM_editCmd.ActiveConnection.Close
  End If
End If
%>
<%
Dim Recordset1
Dim Recordset1_cmd
Dim Recordset1_numRows
Set Recordset1_cmd = Server.CreateObject ("ADODB.Command")
Recordset1_cmd.ActiveConnection = MM_CarboniaWeb_STRING
Recordset1_cmd.CommandText = "SELECT dbBuono.IdBuono, dbBuono.UnitaMisura, dbBuono.UnitaMisura2, dbBuono.UnitaMisura3, dbBuono.prezzoUnit, dbBuono.prezzoUnit2,                        dbBuono.prezzoUnit3, dbBuono.Totale FROM dbBuono INNER JOIN                       db_TipoBuono ON dbBuono.IdTipoBuono = db_TipoBuono.IdTipoBuono WHERE (dbBuono.IdTipoBuono = 1)" 
Recordset1_cmd.Prepared = true
Set Recordset1 = Recordset1_cmd.Execute
Recordset1_numRows = 0
%>
<%
Recordset1.Close()
Set Recordset1 = Nothing
%>
<form method="post" action="<%=MM_editAction%>" name="form2">
  <table width="733" align="center">
    <tr valign="baseline">
      <td nowrap align="right">IdBuono:</td>
      <td><input type="text" name="IdBuono" value="" size="32"></td>
    </tr>
    <tr valign="baseline">
      <td nowrap align="right">UnitaMisura:</td>
      <td><input type="text" name="UnitaMisura" value="" size="32">
      PrezzoUnit:
      <input type="text" name="prezzoUnit" value="" size="32"></td>
    </tr>
    <tr valign="baseline">
      <td nowrap align="right">UnitaMisura2:</td>
      <td><input type="text" name="UnitaMisura2" value="" size="32">
      PrezzoUnit2:
      <input type="text" name="prezzoUnit2" value="" size="32"></td>
    </tr>
    <tr valign="baseline">
      <td nowrap align="right">UnitaMisura3:</td>
      <td><input type="text" name="UnitaMisura3" value="" size="32">
      PrezzoUnit3:
      <input type="text" name="prezzoUnit3" value="" size="32"></td>
    </tr>
    <tr valign="baseline">
      <td nowrap align="right">Totale:</td>
      <td><input type="text" name="Totale" value="" size="32"></td>
    </tr>
    <tr valign="baseline">
      <td nowrap align="right">&nbsp;</td>
      <td><input type="submit" value="Inserisci record"></td>
    </tr>
  </table>
  <input type="hidden" name="MM_insert" value="form2">
</form>
<p>&nbsp;</p>

qualcuno sa come posso fare? Grazie mille per l'aiuto

[Vincent.Zeno]

la tua richiesta è roba javascript

spulcia nella sezione, mi pare ne abbiano parlato anche recentemente

anche con una ricerca in rete dovresti trovare diversi esempi

[morangel]

Grazie Allora posto nella sezione javascript