var rotate_delay = 5000; // delay in milliseconds (5000 = 5 secs)
                current = 1;
                           
                           
                function ap() {
                    rotate();
                }

			    function app(cu) {
			     current=cu;
			     document.images.showimage.src = document.getElementById('immagineGrande_'+current).value;
			     //document.getElementById('showlink').href = document.getElementById('immagineGrande_'+current).src;
				}
                            
                function rotate() {
			     var occorrenze= document.getElementById('occorrenze').value;
					document.images.showimage.src = document.getElementById('immagineGrande_'+current).value;
					
			    
				if (current==occorrenze){
					current=1;
				}
				else{
					current++;
				}
				window.setTimeout("rotate()", rotate_delay);
                            
                }