var please_wait = null;
function open_url(destino, target) {

var url = "inc/"+destino+".php";

 	if ( ! document.getElementById) {
  		return false;
 	}

 	if (please_wait != null) {
  		document.getElementById(target).innerHTML = please_wait;
 	}

 	if (window.ActiveXObject) {
  		link = new ActiveXObject("Microsoft.XMLHTTP");
 	} else if (window.XMLHttpRequest) {
  		link = new XMLHttpRequest();
 	}

 	if (link == undefined) {
  		return false;
 	}
 	link.onreadystatechange = function() { response(url, target); }
 	link.open("GET", url, true);
 	link.send(null);
}

function response(url, target) {
 	if (link.readyState == 4) {
	 	document.getElementById(target).innerHTML = (link.status == 200) ? link.responseText : "<br /><font face=Arial size=2>Ups!! Não foi possível abrir a opção seleccionada. ERRO: " + link.status + "</FONT><br /><br />";
	}
}

function set_loading_message(msg) {
 	please_wait = msg;
}

set_loading_message("<p><font face=Arial color=#808080 size=2> a carregar...</font></p>");