var img = new Array('fussball1', 'fussball2', 'fussball3'); 
var counter = 1;
var number_pics = 3;
var start = null;
var filesource = "images/";	
var filename = "fussball";
var filetype = ".jpg"; 
var delayTime = 5000;


function animate(){
 counter++;
 if(counter > number_pics) counter = 1;
 //document.getElementById("id_counter").textContent = counter; // show counter
 img[counter] = new Image();
 img[counter].src = filesource + filename + counter + filetype;
 document.getElementById("pic1").src = img[counter].src;
 if(counter == number_pics) counter = 0;
} 

function slide(){
 //document.getElementById("id_counter").textContent = counter; // show counter
   start = setInterval("animate()", delayTime);
 //document.getElementById("id_number_pics").textContent = number_pics; // show number pics
}