PHP - funcion para desabiltar campos y select

<script type="text/javascript">

function activar1(){

var primero=document.getElementById("text1").disabled= false;

var segundo=document.getElementById("text2").disabled= false;

var tercero=document.getElementById("BANCO").disabled= false;

var tercero=document.getElementById("TIPO_TARJETA").disabled= false;

var tercero=document.getElementById("REF").disabled= false;

var tercero=document.getElementById("MONTO").disabled= false;

var tercero=document.getElementById("NRO_APROBACION").disabled= false;

}

function activar2(){

var primero=document.getElementById("text1").disabled= true;

var segundo=document.getElementById("text2").disabled= false;

var tercero=document.getElementById("BANCO").disabled= true;

var tercero=document.getElementById("TIPO_TARJETA").disabled= true;

var tercero=document.getElementById("REF").disabled= true;

var tercero=document.getElementById("MONTO").disabled= true;

var tercero=document.getElementById("NRO_APROBACION").disabled= true;

}

function activar3(){

var primero=document.getElementById("text1").disabled= true;

var segundo=document.getElementById("text2").disabled= true;

var tercero=document.getElementById("BANCO").disabled= false;

var tercero=document.getElementById("TIPO_TARJETA").disabled= false;

var tercero=document.getElementById("REF").disabled= false;

var tercero=document.getElementById("MONTO").disabled= false;

var tercero=document.getElementById("NRO_APROBACION").disabled= false;

}</script>

<table align='center' class='table table-hover table-responsive table-bordered'>

 <tr valign='baseline'>

   <th class='textAligncenter'> <button type="button" name="uno" onclick="activar1()" class= 'btn-sm' ><label> Pago Mixto</label></button></th>

<td>

<select id="text1" disabled="disabled" class='form-control'>

<option size="60">Mixto</option>

</select> </td>

</table>

<table align='center' class='table table-hover table-responsive table-bordered'>

  <th class='textAligncenter'> <button type="button" name="dos" onclick="activar2()" class= 'btn-sm'>

    <label>Efectivo</label> </button></th>

  <td><input type="text" id="text2" disabled="disabled" size="60" class='form-control'  />

</table>

<table align='center' class='table table-hover table-responsive table-bordered'>

  <th class='textAligncenter'> <button type="button" name="tres" onclick="activar3()" class= 'btn-sm'><label>Banco</label>

  </button></th>

 <th class='textAligncenter'>Tarjeta</th>

 <th class='textAligncenter'>Referencia</th>

 <th class='textAligncenter'>Monto (USD)</th>

 <th class='textAligncenter'>Nro Aprobaci�n</th>

      <tr valign='baseline'>

     <td>

  <select id="BANCO" disabled="disabled" class='form-control' >

    <option value='0171'>BANCO ACTIVO BANCO COMERCIAL, C.A.</option>

       <option value='0115'>BANCO EXTERIOR C.A.</option>

       <option value='0190'>CITIBANK.</option>

    <option value='0121'>CORP BANCA.</option>

    <option value='0137'>SOFITASA</option>

  </select>

    <td> <select id="TIPO_TARJETA" disabled="disabled" class='form-control' >

    <option  >Maestro -Debito</option>

    <option  >Mastercad -Credito</option>

    <option >Visa -Credito</option>

  </select></td>

    <td > <input type="text" id="REF" disabled="disabled" / class='form-control'></td>

    <td ><input type="text" id="MONTO" disabled="disabled"  / class='form-control'></td>

   <td >  <input type="text" id="NRO_APROBACION" disabled="disabled" class='form-control' /></td>

</table>

mysql_select_db($database_sinveck, $sinveck);

$query_pago = "SELECT * FROM pago_banco";

$pago = mysql_query($query_pago, $sinveck) or die(mysql_error());

$row_pago = mysql_fetch_assoc($pago);

$totalRows_pago = mysql_num_rows($pago);

<?php require_once('Connections/sinveck.php');

$TIPO_TARJETA = isset($_GET['TIPO_TARJETA']) ? $_GET['TIPO_TARJETA'] : "";

$BANCO = isset($_GET['BANCO']) ? $_GET['BANCO'] : "";

$REF = isset($_GET['REF']) ? $_GET['REF'] : "";

$MONTO = isset($_GET['REF']) ? $_GET['REF'] : "";

$NRO_APROBACION = isset($_GET['REF']) ? $_GET['REF'] : "";

?>

<?php

  echo "<table class='table table-hover table-responsive table-bordered'>";

  	echo "   <td><input type='text' id='$TIPO_TARJETA' name='TIPO_TARJETA' value=".$TIPO_TARJETA." style='display:none;' class='form-control'></td>";

	    echo "   <td><input type='text' id='$BANCO' name='BANCO' value=".$BANCO." 'style='display:none;' class='form-control'></td>";

		echo "   <td><input type='text' id='$REF' name='REF' value=".$REF." 'style='display:none;'class='form-control' ></td>";

		echo "   <td><input type='double' id='$MONTO' name='MONTO' value=".round($MONTO,2)." class='form-control'style='display:none;'class='form-control' ></td>";

	    echo "   <td><input type='int' id='$NRO_APROBACION' name='NRO_APROBACION' value=".$NRO_APROBACION." 'style='display:none;'class='form-control' ></td>";

	?>