var n;

function imgSwap(){

  clearInterval(n);
  var latestEvent = document.getElementById("latest_events");
  if(latestEvent){
    var images = latestEvent.getElementsByTagName("img");

    for(var j = 0; j < images.length; j++){

      if(images[j].style.visibility == "visible"){

        // set this to invisible and set the next one to visible        
        images[j].style.visibility = "hidden";
        var idxToMakeVisible = (j == (images.length -1)) ? 0 : (j+1);
        images[idxToMakeVisible].style.visibility = "visible";
        
        break;
      }
    }
  }

  n = setInterval("imgSwap()", 2000); 
}