//------> Função basica de Ajax
//  abrir('url','div');
// <a href="javascript:void(0)" onclick="abrir('url','div');">

function abrir(url, target) {

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

 	if ( target=="membros-main") {
		document.getElementById(target).innerHTML= "<div align='center'><p>&nbsp;</p><p>&nbsp;</p><p>&nbsp;</p><p>&nbsp;</p><p>&nbsp;</p><p>&nbsp;</p><p>&nbsp;</p><p><font face='Tahoma' style='font-size: 9pt' color='#333333'>a carregar! aguarde...</font></p></div>";	

 	} else {
		document.getElementById(target).innerHTML= "<div align='center'><br /><p><font face='Arial' size='1'><img border='0' src='./images/loading_2.gif' width='32' height='32' alt='' /><br /><font color='#808080'>A carregar, aguarde...</font></font></p></div>";
 	}
 	

 	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("POST", url, true);
	link.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
	link.setRequestHeader("Cache-Control", "no-store, no-cache, must-revalidate");
	link.setRequestHeader("Cache-Control", "post-check=0, pre-check=0");
	link.setRequestHeader("Content-Type", "application/x-www-form-urlencoded; charset=iso-8859-1");
	link.setRequestHeader("Pragma", "no-cache");
 	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 />";
	}
}


//------> Função para forms


function enviaForm(frmNome, url, destino){
f = document.getElementById(frmNome);
var query=url;
for (i=0;i<f.elements.length;i++){
query += i==0 ? '?' : '&';

if (f.elements[i].type =='checkbox' && !(f.elements[i].checked))
query += f.elements[i].name + '=0';
else
query += f.elements[i].name + '=' + f.elements[i].value;
}
abrir(query, destino);
}