// Please insert your JavaScript here:
var finished = false;
var i = 0;
function ike_slideshow( slideshow_id, jump ) {
  slideshow = document.getElementById( slideshow_id );
  images = slideshow.getElementsByTagName( "li" );
  finished=false;
  for(i=0;i<images.length;i++){
    if(finished) break;
    if(images[i].style.display=="block") {
      if((i==0&&jump==-1)||(i+1==images.length&&jump==1)) break;
        images[i+jump].style.display="block";
        images[i].style.display="none";
        finished=true;
      }
    }
}