function conteudos(morada,area){
if (morada==""){
  document.getElementById("div_area").innerHTML="";
  return;
  } 

if (window.XMLHttpRequest){// code for IE7+, Firefox, Chrome, Opera, Safari
  xmlhttp=new XMLHttpRequest();
  
}else{// code for IE6, IE5
  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  }


xmlhttp.onreadystatechange=function(){
  if (xmlhttp.readyState==4 && xmlhttp.status==200){
    document.getElementById("div_area").innerHTML=xmlhttp.responseText;
    }
  }

xmlhttp.open("GET",+morada,true);
xmlhttp.send();
}