NAVIGATION PAR AJAX, CHARGEMENT DES PAGES SANS RECHARGEMENT

		var xhr_object = null; // declaration de la variable
                var longueur_init=0;
		if(window.XMLHttpRequest){ // Firefox 
			  xhr_object = new XMLHttpRequest();} // declaration de lobjet
		else if(window.ActiveXObject){ 
					//IE 6.0 et les plus anciens
				var XmlHttpVersions = new Array("MSXML2.XMLHTTP.6.0",
										"MSXML2.XMLHTTP.5.0",
										"MSXML2.XMLHTTP.4.0",
										"MSXML2.XMLHTTP.3.0",
										"MSXML2.XMLHTTP",
										"Microsoft.XMLHTTP");
					for(var i=0; i<XmlHttpVersions.length && !xhr_object; i++){
						try{
							//cree l'objet XmlHttpRequest
							xhr_object = new ActiveXObject(XmlHttpVersions[i])
							}
						catch(error){}
					}

		}else { // XMLHttpRequest non supporté par le navigateur 
			var xhr_object = null;
		}	
var Cache = new Array();
function changePage(hash){
		var page = hash.replace("#","")+".html";
		if(typeof(Cache[page]) == "undefined"){
		xhr_object.open("GET", page, true);
		xhr_object.onreadystatechange = function(){
			if(xhr_object.readyState == 4 && (xhr_object.status == 200 || xhr_object.status == 0)){
			document.getElementById('page').innerHTML = xhr_object.responseText;
			Cache[page] = xhr_object.responseText;
			document.location.hash=hash;
			_Hashencours = hash;
			}
		}
		xhr_object.send(null);
		}else{
		document.getElementById('page').innerHTML = Cache[page];document.location.hash=hash;_Hashencours = hash;}
		
}

var _Hashencours=document.location.hash;
window.onload=function(){if(_Hashencours != ""){changePage(_Hashencours);}else{changePage('accueil');}}

window.setInterval(function(){
			if(_Hashencours != document.location.hash){
					changePage(document.location.hash);
			}
	},100);