var myImg= new Array();
            var legende= new Array();

            var n = 1;
            var i = 1;
            var temp = "photo1";
            var duree = 0;
            var dureemax = 5; //temps en secondes entre chaque changement de photo

            function loadImg(){
                duree=0;
                document.photo.src = myImg[i-1];
                temp = "photo" + i;
                document.getElementById(temp).className="on";
                document.getElementById("legend").innerHTML=legende[i-1];
            }

            function prevphoto(){
                razbg();
                if(i!=1){
                    i-=1;
                }
                loadImg();
            }
            function nextphoto(){
                razbg();
                if(i<total){
                    i+=1;
                }
                else i=1;
                loadImg();
            }
            function affichephoto(n){
                razbg();
                i=n;
                loadImg();
            }

            function razbg(){
                for (var j=1; j<total+1; j++) {
                    temp= "photo" + j;
                    document.getElementById(temp).className="";
                }
            }
            function defilement(){
                duree++;
                if (duree==dureemax) nextphoto();
            }

            window.onload=loadImg;