ahora me quedo asi , pero nose no me muetsra el select ni los datos en el formulario
<HTML>
<HEAD>
<TITLE>Actualizar.php</TITLE>
<LINK REL="STYLESHEET" HREF="style.css" TYPE="text/css">
</HEAD>
<BODY>
<?php
include('config.php');
$link=Conectarse();
$sql="select A.di_numdi, B.di_codestado_id,B.nomempr, B.nomtransp, A,crt_numcrt, A.mezcla, A.merc, A.codaran, A.cant_merc, A.kmeto FROM item A, emptrans B WHERE A.id = B.id AND A.id = '".$_POST['id_numdi']."'";
$result=mysql_query($sql, $link);
echo "<select name=\"id_numdi\">";
while ($row=mysql_fetch_array($result)){
echo "<option value=\"".$row['id_numdi']."\">".$row['numdi']."</option>";
}
?>
</select>
<br>
DI<br>
<body topmargin="0" leftmargin="0" marginheight="0" marginwidth="0">
<table width="780" border="0" cellspacing="0" cellpadding="0">
<tr>
<td> </td>
</tr>
</table>
<table width="780" border="0" cellspacing="0" cellpadding="0">
<tr>
<td>
<table width="780" border="0" cellspacing="0" cellpadding="0" height="50">
<tr>
<td> </td>
</tr>
<tr>
<td valign="top"> </td>
</tr>
</table>
</td>
</tr>
</table>
<table width="780" border="0" cellspacing="0" cellpadding="0">
<tr>
<td class="texto1" align="center"><table width="520" border="0" cellspacing="0" cellpadding="0" class="borderB">
<tr>
<td height="14" class="texto1b" bgcolor="#FFFFFF"><b><img src="images/isotipo.jpg" width="573" height="67" align="top"></b></td>
</tr>
<tr>
<td height="1" bgcolor="353648"></td>
</tr>
<tr>
<td height="4"></td>
</tr>
<tr>
<td> <table width="508" border="0" cellspacing="0" cellpadding="0" align="center" class="borderA" height="300">
<tr>
<td bgcolor="ececef"> <table border="0" cellpadding="0" cellspacing="0" width="100%" class="texto1" >
<tr>
<td valign="top" width="468"> <table border=0 cellpadding=10 cellspacing=0 bgcolor="ececef" class="texto1" width="100%">
<form method="get" action='actualizardi2.php'>
<input type=hidden name='id' value='$row[0]' >
<tr valign=top>
<td><br>
Modifique los datos de la DI<br> <br>
<br> <br>
<table class="texto1" border=0 cellpadding=5 cellspacing=0>
<tr>
<td colspan=2 height="10"></td>
</tr>
<tr>
<td width="164">Numero DI</td>
<td width="273"> <input type='hidden'name=numdi class="input">
</td>
</tr>
<tr>
<td width="164">Estado DI</td>
<td width="273"> <input type= text name=codestado class="input" value='<? "$row[codestado]"; ?>'
>
</td>
</tr>
<tr>
<td>Empresa Transporte</td>
<td> <input name=nomempr class="input" value='<? "$row[nomempr]"; ?>'>
</td>
</tr>
<tr>
<td>Transportista </td>
<td> <input name=nomtransp class="input" value='<? "$row[nomtransp]"; ?>'>
</td>
</tr>
<tr>
<td>Crt</td>
<td> <input name=numcrt class="input" value='<? "$row[numcrt]"; ?>'>
</td>
</tr>
<tr>
<td>Mezcla</td>
<td> <input name=mezcla class="input" value='<? "$row[mezcla]"; ?>'>
</td>
</tr>
<tr>
<td>Mercancia </td>
<td> <input name=merc class="input" value='<? "$row[merc]"; ?>'>
</td>
</tr>
<td>Kn</td>
<td> <input name=kneto class="input" value='<?" $row[kneto]"; ?>'>
</td>
</tr>
<tr>
<td>Codigo Arancelario </td>
<td> <input type=text name=codaran value='' class="input" value='<? "$row[codaran]"; ?>'>
</td>
</tr>
<tr>
<td>Cantidad Mercancia </td>
<td> <input name=cant_merc value="" class="input" value='<? "$row[cant_merc]"; ?>'>
</td>
</tr>
<tr>
<td colspan=2> </td>
</tr>
<tr>
<td align=middle colspan=2><div align="center"> <input type="submit" name="image" type="image" src="images/enviar.gif" align="middle" width="58" height="11" border="0">
</div></td>
</tr>
</table></td>
</tr>
</form>
</table></td>
</tr>
</table></td>
</tr>
</table></td>
</tr>
<tr>
<td height="4"></td>
</tr>
</table>
<table width="427" border="0" cellspacing="0" cellpadding="0">
<tr>
<td height="5"></td>
</tr>
</table>
<td width="20"></td>
</tr>
</table>
<table width="780" border="0" cellspacing="0" cellpadding="0">
<tr>
<td> </td>
</tr>
</table>
</form>
este es el codigo para actualizar
</HEAD>
<BODY>
<?php
$numdi = $_GET["numdi"];
$codestado = $_GET["codestado"];
$nomempr = $_GET["nomempr"];
$nomtransp = $_GET["nomtransp"];
$numcrt=$_GET["numcrt"];
$mezcla=$_GET["mezcla"];
$codaran=$_GET["codaran"];
$merc=$_GET["merc"];
$cant_merc=$_GET["cant_merc"];
$kneto=$_GET["kneto"];
$sql="update emprtrans nomempr='$nomempr', nomtransp ='$nomtransp' where id='$id'";
$sql=mysql_query($sql,$link);
$sql="update crt numcrt='$numcrt' where id='$id'";
$sql=mysql_query($sql,$link);
$sql="update item mezcla='$mezcla' ,merc='$merc' ,codaran='$codaran', cant_merc='$cant_merc' , kneto='$kneto'";
$sql=mysql_query($sql,$link);
?>
<h1><div align="center">Registro Actualizado</div></h1>
<div align="center"><a href="lectura.php">Visualizar el contenido de la base</a></div>
</BODY>
</HTML>
ups que largo
ayuda plis