function swapStories(numStories, delay) {

  var name = "";
  
  for (var i = 1; i <= numStories; i++) {
    
    name = "topstory-" + i;
    
    if (i == visibleStory) {
      document.getElementById(name).style.visibility = 'visible';    
    }
    else {
      document.getElementById(name).style.visibility = 'hidden';    
    }
  }
  
  visibleStory ++;
  if (visibleStory > numStories) {
    visibleStory = 1;
  }

  var t = setTimeout("swapStories(numStories, delay)", delay);  
  
}


function swapPictures(step) {

  visibleStory += step;
  
  if (visibleStory > (numStories - 1)) {
    visibleStory = 0;
  }

  if (visibleStory < 0) {
    visibleStory = (numStories - 1);
  }  

  for (var i = 0; i < numStories; i++) {
    
    name = "picture-" + i;
    navname = "nav-" + i;    
    
    if (i == visibleStory) {
      document.getElementById(name).style.display = 'block';
      document.getElementById(navname).style.color = '#1f145d';       
    }
    else {
      document.getElementById(name).style.display = 'none';
      document.getElementById(navname).style.color = '#ec7a08';          
    }
  }
}