echela un ojo aeste script
asi.php
Código PHP:
<?php
if(isset($_POST["tipo"]))
{
if($_POST["tipo"] == "1")
header("Location : http://www.yahoo.com");
elseif ($_POST["tipo"] == "3")
header("Location: http://www.google.com");
}
?>
<html>
<script language="javascript">
function Enviar()
{
document.form1.submit();
}
</script>
<form id="form1" name="form1" method="post" action="asi.php">
<label>
Tipo noticia:
<select name="tipo" onchange="Enviar()">
<option>Selecccionar</option>
<option value="1">Bando</option>
<option value="3">Nota informativa</option>
</select>
</label>
</form>
</html>