var url = "menu-lateral.asp?cod="; // The server-side script
       function handleHttpResponse() {    
        if (http.readyState == 4) {
              if(http.status==200) {
                  var results=http.responseText;
              document.getElementById('divCustomerInfo').innerHTML = results;
              }
              }
        }
        
        function rc(mod) {      
            http.open("GET", url + mod , true);
            http.onreadystatechange = handleHttpResponse;
            http.send(null);
        }
function getHTTPObject() {
  var xmlhttp;
 
  if(window.XMLHttpRequest){
    xmlhttp = new XMLHttpRequest();
  }
  else if (window.ActiveXObject){
    xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
    if (!xmlhttp){
        xmlhttp=new ActiveXObject("Msxml2.XMLHTTP");
    }
    
}
  return xmlhttp;  
}
var http = getHTTPObject(); // We create the HTTP Object