Código PHP:
<head>
<SCRIPT LANGUAGE="JavaScript">
function Enviar() {
document.buscador.submit();
}
</script>
<? $Campo = $Campo;?>
</head>
<body>
<center>
<form name="buscador" method="post" action="logged.php">
<table width="39%" border="0" align="center" cellpadding="0" cellspacing="0">
<tr>
<td align="center" valign="middle">Buscar en:
<SELECT NAME="Campo" onChange="Enviar()">
<option value="0" <? if($Campo== 0){ echo selected ;}?>>Seleccione
<option value="1" <? if($Campo== 1){ echo selected ;}?>>Fecha de Llegada
<option value="2" <? if($Campo== 2){ echo selected ;}?>>Fecha de Alta
<option value="3" <? if($Campo== 3){ echo selected ;}?>>House
<option value="4" <? if($Campo== 4){ echo selected ;}?>>Master
<option value="5" <? if($Campo== 5){ echo selected ;}?>>Nro. de Opercion
<option value="6" <? if($Campo== 6){ echo selected ;}?>>Vuelo
</select>
</td>
</tr>
</table>
</form>
</center>
<?PHP
$i = $_POST['Campo'];
switch ($i):
case 1:
echo
"<table width='39%' border='0' align='center' cellpadding='0' cellspacing='0'>
<tr>
<td align='center' valign='middle'>
<form name='form2' method='post' action=''>
<div align='center'><br>
Fecha de Llegada </div>
<table width='70%' border='0' align='center' cellpadding='2' cellspacing='0'>
<tr>
<td width='33%'></td>
<td width='2%'></td>
<td width='65%'></td>
</tr>
<tr>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td><div align='right'>Desde</div></td>
<td></td>
<td><input name='textfield4' type='text' value='AAAA-MM-DD'>
Ej.: 2005-05-33</td>
</tr>
<tr>
<td><div align='right'>Hasta</div></td>
<td></td>
<td><input name='textfield22' type='text' value='AAAA-MM-DD'>
Ej.: 2005-05-33 </td>
</tr>
<tr>
<td></td>
<td></td>
<td></td>
</tr>
</table>
<p> </p>
</form></td>
</tr>
</table>";
break; //fecha de llegada
case 2:
echo "<form name='form2' method='post' action=''>
<div align='center'><br>
Fecha de Alta </div>
<table width='70%' border='0' align='center' cellpadding='2' cellspacing='0'>
<tr>
<td width='33%'></td>
<td width='2%'></td>
<td width='65%'></td>
</tr>
<tr>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td><div align='right'>Desde</div></td>
<td></td>
<td><input name='textfield4' type='text' value='AAAA-MM-DD'>
Ej.: 2005-05-33</td>
</tr>
<tr>
<td><div align='right'>Hasta</div></td>
<td></td>
<td><input name='textfield22' type='text' value='AAAA-MM-DD'>
Ej.: 2005-05-33 </td>
</tr>
<tr>
<td></td>
<td></td>
<td></td>
</tr>
</table>
<p> </p>
</form>";
break; //fecha de alta
case 3:
echo "<form name='form2' method='post' action=''>
<p align='center'> </p>
<table width='70%' border='0' align='center' cellpadding='2' cellspacing='0'>
<tr>
<td width='33%'></td>
<td width='2%'></td>
<td width='65%'></td>
</tr>
<tr>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td><div align='right'>Número de House </div></td>
<td></td>
<td><input name='textfield3' type='text' value='nro house'>
Ej.: </td>
</tr>
<tr>
<td></td>
<td></td>
<td></td>
</tr>
</table>
<p> </p>
</form>";
break; //house
case 4:
echo "<form name='form2' method='post' action=''>
<p align='center'> </p>
<table width='70%' border='0' align='center' cellpadding='2' cellspacing='0'>
<tr>
<td width='33%'></td>
<td width='2%'></td>
<td width='65%'></td>
</tr>
<tr>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td><div align='right'>Número de Master </div></td>
<td></td>
<td><input name='textfield32' type='text' value='nro master'>
Ej.: </td>
</tr>
<tr>
<td></td>
<td></td>
<td></td>
</tr>
</table>
<p> </p>
</form>";
break; //master
case 5:
echo "<form name='form2' method='post' action=''>
<p align='center'> </p>
<table width='70%' border='0' align='center' cellpadding='2' cellspacing='0'>
<tr>
<td width='33%'></td>
<td width='2%'></td>
<td width='65%'></td>
</tr>
<tr>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td><div align='right'>Número de Operación </div></td>
<td></td>
<td><input name='textfield322' type='text' value='nro operacion'>
Ej.: </td>
</tr>
<tr>
<td></td>
<td></td>
<td></td>
</tr>
</table>
<p> </p>
</form>";
break; //nro operacion
case 6:
echo "<form name='form2' method='post' action=''>
<p align='center'> </p>
<table width='70%' border='0' align='center' cellpadding='2' cellspacing='0'>
<tr>
<td width='33%'></td>
<td width='2%'></td>
<td width='65%'></td>
</tr>
<tr>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td><div align='right'>Número de Vuelo </div></td>
<td></td>
<td><input name='textfield322' type='text' value='nro vuelo'>
Ej.: </td>
</tr>
<tr>
<td></td>
<td></td>
<td></td>
</tr>
</table>
<p> </p>
</form>";
break; //vuelo
endswitch;
?>
</body>
</html>