function scorri(mov){

if(mov==1){
if(a==n){a=0; b=1;}else{a=a+1; if(a==n){b=0;}else{b=a+1;}}
          }

if(mov==0){
if(a==0){a=n; b=0;}else{a=a-1; if(a==0){b=1}else{b=a+1;}}
          }
c=a+1; d=b+1;
// alert(c+"-"+d);

document.getElementById('prenews').innerHTML=contenuti[a];
document.getElementById('fotoa').innerHTML=foto[a];
document.getElementById('fotob').innerHTML=fototemp[b];

                    }