function moveElement(elementID,final_x,final_y,interval) {
  if (!document.getElementById) return false;
  if (!document.getElementById(elementID)) return false;
  var elem = document.getElementById(elementID);
  if (elem.movement) {
    clearTimeout(elem.movement);
  }
  var xpos = parseInt(elem.style.left);
  var ypos = parseInt(elem.style.top);

  if (xpos == final_x && ypos == final_y) {
    return true;
  }
  if (xpos < final_x) {
    xpos++;
  }
  if (xpos > final_x) {
    xpos--;
  }
  if (ypos < final_y) {
    ypos++;
  }
  if (ypos > final_y) {
    ypos--;
  }
  elem.style.left = xpos + "px";
  elem.style.top = ypos + "px";
  var repeat = "moveElement('"+elementID+"',"+final_x+","+final_y+","+interval+")";
  elem.movement = setTimeout(repeat,interval);
}

function stop(elementID) {
  if (!document.getElementById) return false;
  if (!document.getElementById(elementID)) return false;
  var elem = document.getElementById(elementID);
  if (elem.movement) {
    clearTimeout(elem.movement);
    }
  }
  
  function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      oldonload();
      func();
    }
  }
}

function prepareSlideshow() {
// Make sure the browser understands the DOM methods
  if (!document.getElementsByTagName) return false;
  if (!document.getElementById) return false;
// Make sure the elements exist
 
  if (!document.getElementById("preview")) return false;
// Apply styles to the preview image
  var preview = document.getElementById("preview");
  preview.style.position = "absolute";
  preview.style.left = "-418px";
  preview.style.top = "0px";

/*
	var left = document.getElementById("leftbutton");
  var right = document.getElementById("rightbutton");
// Attach the animation behavior to the mouseover event
  left.onmouseover = function() {
	imgSwap(left);
    moveElement("preview",0,0,1);
  }
  left.onmouseout = function() {
	imgSwap(left);
    stop("preview");
  }
  right.onmouseover = function() {
	imgSwap(right);
    moveElement("preview",-3557,0,1);
  }
    right.onmouseout = function() {
	imgSwap(right);
     stop("preview");
  }  
*/
  var left_a = document.getElementById("leftarea");
  var right_a = document.getElementById("rightarea");
  left_a.onmouseover = function() {
	imgSwap(left_a);
    moveElement("preview",0,0,1);
  }
  left_a.onmouseout = function() {
	imgSwap(left_a);
    stop("preview");
  }
  right_a.onmouseover = function() {
	imgSwap(right_a);
    moveElement("preview",-3557,0,1);
  }
    right_a.onmouseout = function() {
 	imgSwap(right_a);
    stop("preview");
  }  
}