Someone

function alterarTipologia(obj) {
//    document.getElementById('Submit_search').disabled = true;
//    document.getElementById('Submit_search').value = "A pesquisar...";

    //Build the URL to connect to
    var url = "/commons/ajax_files/runtime/functions.ajax.php?function=dropdownTipologia&id_natureza="
              + encodeURI( document.getElementById("id_natureza").value ) + "&id_tipologia="
			  + encodeURI( document.getElementById("id_tipologia").value );

	// Open a connection to the server
    callServer();
    xmlHttp.open("POST", url, true);

    // Setup a function for the server to run when it's done
    xmlHttp.onreadystatechange = listarTipologia;

    // Send the request
    xmlHttp.send(null);

//    document.getElementById('Submit_search').value = "Pesquisar";
//    document.getElementById('Submit_search').disabled = false;
}

function listarTipologia() {
    if (xmlHttp.readyState == 4) {
       if (xmlHttp.status == 200) {

          result = xmlHttp.responseText;
		  document.getElementById('tipologia').innerHTML = decodeURI( result );

       } else {
          alert('There was a problem with the request.');
       }
    }
}

function countSearch() {
    //Build the URL to connect to if span exists
	//if (document.getElementById("searchTotal") !== null) {
    	var url = "/commons/ajax_files/runtime/functions.ajax.php?function=countSearchProperties&id_natureza="
     	          + encodeURI( document.getElementById("id_natureza").value ) + "&id_tipologia="
				  + encodeURI( document.getElementById("id_tipologia").value ) + "&id_negocio="
				  + encodeURI( document.getElementById("tipo_negocio").value ) + "&cod_distrito=" 
				  + encodeURI( document.getElementById("cod_distrito").value ) + "&cod_concelho="
				  + encodeURI( document.getElementById("cod_concelho").value );

		// Open a connection to the server
    	callServer();
	    xmlHttp.open("POST", url, true);

    	// Setup a function for the server to run when it's done
   		xmlHttp.onreadystatechange = listTotalProperties;

    	// Send the request
    	xmlHttp.send(null);
	//}
}

function listTotalProperties() {
    if (xmlHttp.readyState == 4) {
       if (xmlHttp.status == 200) {

          result = xmlHttp.responseText;
		  //alert(result);
		  document.getElementById('searchTotal').innerHTML = decodeURI( result );

       } else {
          alert('There was a problem with the request.');
       }
    }
}