este es el formulario de cerrar_session;
Código PHP:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>..::CITEC::..</title>
</head>
<body style="topmargin:'25'" onUnload="javascript:window.location.href='index.php?menu=cerrar';">
</body>
</html>