function ValCorreoWeb(form,avir)
{
	var mensaje = "Es necesario escribir:\n";
	var campo = 0;
	if (form.login_username.value.length == 0) {
	    mensaje += "- Un nombre de buzon o cuenta interna.\n";
	    if (campo == 0) campo = 1;
	}
	if (form.secretkey.value.length == 0) {
	    mensaje += "- Una clave.\n";
	    if (campo == 0) campo = 2;
	}

	if (campo) {
	    alert(mensaje);
	    if (campo == 1) form.login_username.focus();
	    else if (campo == 2) form.secretkey.focus();
	} else {
			var i = form.login_username.value.length;
			var temp = form.login_username.value.substring (i-3, i);
			if (temp == "uol") form.secretkey.value = "ghndtfndhgn";
			else if (i >= 5) {
				temp = form.login_username.value.substring (i-5, i);
				if (temp == "unica") form.secretkey.value = "dgmntykjm";
				else if (i >= 11) {
					temp = form.login_username.value.substring (i-11, i);
					if (temp == "unicaonline") form.secretkey.value = "dgmntykjm";
				}
			}
			if (avir == 1) form.action = "http://www.nahitek.com:8181/webmail03/src/redirect.php";
			else if (avir == 8) form.action = "http://mailweb.nahitek.com/webmail02/src/redirect_antispam.php";
			else if (avir == 12) form.action = "http://www.nahitek.com/correoviaweb.jsp";
			else form.action = "http://mailweb.nahitek.com/webmail02/src/redirect.php";
			form.submit();
	}
}