function change_active(name,id,max,active) {
  for (var i = 1; i <= max; i++) {
    if(document.getElementById(name+i)) document.getElementById(name+i).style.display = 'none';
    if(document.getElementById(active+i)) document.getElementById(active+i).className = ''; 
  }
  document.getElementById(active+id).className = 'active';
  document.getElementById(name+id).style.display = 'block';

}
function hide(element) {
	if(document.getElementById(element)) document.getElementById(element).style.display = 'none';
}

var special = 1;
function changespecial() {
    special++;
    if(special==5) {
        special = 1;
    }
    change_active('special',special,'5','sp');
}

var interval = window.setInterval("changespecial()", 5000);