var myRequest = null;

function CreateXmlHttpReq2(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;
}

function myHandler2() {
		
	if (myRequest.readyState == 2){
		e = document.getElementById("principale_box");
		e.innerHTML='<div id="aja"><img src="car.gif" alt="Attendi il caricamento"/></div>';
		
		
	}
    if (myRequest.readyState == 4 && myRequest.status == 200) {
        e = document.getElementById("principale_box");
        e.innerHTML = myRequest.responseText;
    }else{
    	e = document.getElementById("principale_box");
	e.innerHTML='<div id="aja"><img src="car.gif" alt="Attendi il caricamento"/></div>';
		
    }
}
function myHandler3() {
		
	if (myRequest.readyState == 2){
		e = document.getElementById("boxVideoDx");
		e.innerHTML='<div id="aja"><img src="car.gif" alt="Attendi il caricamento"/></div>';
		
		
	}
    if (myRequest.readyState == 4 && myRequest.status == 200) {
        e = document.getElementById("boxVideoDx");
        e.innerHTML = myRequest.responseText;
    }else{
    	e = document.getElementById("boxVideoDx");
	e.innerHTML='<div id="aja"><img src="car.gif" alt="Attendi il caricamento"/></div>';
		
    }
}

function boxPrincipaleLoadContent(href_link,id_link) {
    var href = href_link;
    var id = id_link;
    var r = Math.random();
  	document.getElementById("evidenzalink1").className = "evidenzalink";
  	document.getElementById("evidenzalink2").className = "evidenzalink";
  	document.getElementById("evidenzalink3").className = "evidenzalink";
  	document.getElementById("evidenzalink4").className = "evidenzalink";
    
    document.getElementById(id_link).className = "activelink";
    myRequest = CreateXmlHttpReq2(myHandler2);
 	
    myRequest.open("GET","boxCentrale.php?content="+href+"&rand="+escape(r));
    myRequest.send(null);

}


function boxCentraleVideoLoad(video){
	
	var r = Math.random();
	
	/**
	prima resetto tutti i src di tutte le immagini poi con 4 if imposto l'over in base alla variabile video
	*/
	
	document.getElementById("img1").src = "images/bt_pres.gif";
	document.getElementById("img2").src = "images/bt_libri.gif";
	document.getElementById("img3").src = "images/bt_rivista.gif";
	document.getElementById("img4").src = "images/bt_attivita.gif";
	
	
	if(video=='presentazione'){
		document.getElementById("img1").src = "images/bt_pres_over.gif";
	}
	if(video=='libri'){
		document.getElementById("img2").src = "images/bt_libri_over.gif";
	}
	if(video=='rivista'){
		document.getElementById("img3").src = "images/bt_rivista_over.gif";
	}
	if(video=='attivita'){
		document.getElementById("img4").src = "images/bt_attivita_over.gif";
	}
	
	myRequest = CreateXmlHttpReq2(myHandler3);
	
	myRequest.open("GET","videoLoad.php?video="+video+"&rand="+escape(r));
	myRequest.send(null);
	
}