Campo vacio inserte valor por defecto

[reimonfranco]

checate esto:

<?
if(isset($_POST['btn'])) {
$campo = $_POST['ruta'];
if ($campo == "")
$campo = "../images/spacer.gif";
mysql_query("insert into(campo) values($campo)");
}
?>

<form method='post'>
<input name='ruta' type='text' size='50' value='<? echo @$campo; ?>'>
<input type='submit' name='btn'>
</form>