// Create the XML HTTP request object. More cross-browser as possible.
function CreateXmlHttpReq(handler) {
  var xmlhttp = null;
  try {
    xmlhttp = new XMLHttpRequest();
  } catch(e) {
    try {
        xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
    } catch(e) {
        xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
    }
  }
  xmlhttp.onreadystatechange = handler;
  return xmlhttp;
}

// An handler that does nothing
function DummyHandler() {
    return true;
}

// Shortcut for creating a GET request and get the reply
function ajaxGet(url,handler) {
    var a = new Array("placeholder");
    for (var j=2; j<arguments.length; j++) {
        a[a.length] = arguments[j];
    }
    var ajax_req = CreateXmlHttpReq(DummyHandler);
    var myhandler = function() {
        var content = ajaxOk(ajax_req);
        if (content !== false) {
            a[0] = content;
            try {
                return handler.apply(this, a);
            } catch(e) {
                return myDummyApply(handler, a);
            }
        }
    }
    ajax_req.onreadystatechange = myhandler;
    ajax_req.open("GET",url);
    ajax_req.send(null);
}

// IE 5.0 hack for apply
function myDummyApply(funcname,args) {
    var e = "funcname(";
    for (var i = 0; i < args.length; i++) {
        e += "args["+i+"]";
        if (i+1 != args.length) {
            e += ",";
        }
    }
    e += ");"
    return eval(e);
}

// Add a random parameter to the get request to avoid IE caching madness.
function ajaxGetRand(url,handler) {
    url += (url.indexOf("?") == -1) ? "?" : "&";
    url += "rand="+escape(Math.random());
    arguments[0] = url;
    try {
        return ajaxGet.apply(this,arguments);
    } catch(e) {
        return myDummyApply(ajaxGet,arguments);
    }
}

function ajaxOk(req) {
    if (req.readyState == 4 && req.status == 200) {
        return req.responseText;
    } else {
        return false;
    }
}

function $(id) {
    return document.getElementById(id);
}

function $html(id) {
    return $(id).innerHTML;
}

function $sethtml(id,html) {
    $(id).innerHTML = html;
}

function $apphtml(id,html) {
    $(id).innerHTML += html;
}

function ajaxLoader(url,id) {
  if (document.getElementById) {
    var x = (window.ActiveXObject) ? new ActiveXObject("Microsoft.XMLHTTP") : new XMLHttpRequest();
  }
  if (x) {
    x.onreadystatechange = function() {
      if (x.readyState == 4 && x.status == 200) {
        el = document.getElementById(id);
        el.innerHTML = x.responseText;
      }
    }
    x.open("GET", url, true);
    x.send(null);
  }
}

/* Funzione Ajax Sincrona che attende la response della pagina chiamata in GET*/
function getFileAjax(url) {  

      if (window.XMLHttpRequest) {
        AJAX=new XMLHttpRequest();
      } 
      else {                                      
        AJAX=new ActiveXObject("Microsoft.XMLHTTP");  
      }  
      if (AJAX) {     
        AJAX.open("GET", url, false);
        AJAX.send(null);     
        return AJAX.responseText;                                           
      } 
      else {     
        return false;  
      }                                             
}
/* Funzione Ajax Sincrona che attende la response della pagina chiamata in POST*/
function getFilePostAjax(url, passData) {  
      if (window.XMLHttpRequest) {                  
        AJAX=new XMLHttpRequest();                
      } else {                                      
        AJAX=new ActiveXObject("Microsoft.XMLHTTP");  
      }  
      if (AJAX) {    
        AJAX.open("POST", url, false);    
        AJAX.setRequestHeader("Content-type", "application/x-www-form-urlencoded");    
        AJAX.send(passData);    
        return AJAX.responseText;                                           
      } else {     
        return false;  
      }                                             
}