funcion para hacer un combo box en php
function combo($tabla,$cod,$des,$valor)
{$r=mysql_query("select $cod,$des from
$tabla");
$cad="<select
name="$cod">";</select>
if($valor==""){$cad=$cad."<option
value="0">Seleccione.... </option>";}
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while($f=mysql_fetch_array($r))
{ $c=$f[$cod]; $d=$f[$des];
if($c==$valor)
{$cad=$cad."<option selected="selected"
value="$c"> $d </option>";}
else
{
$cad=$cad."<option value="$c"> $d
</option>";
}
}
$cad=$cad."</div>
";
return $cad;
}
<script> alert("Acceso Denegado");
history.back();</P><p>
</P><p>
</script>