var rightImages=['images/swap/image1.jpg','images/swap/image2.jpg','images/swap/image3.jpg','images/swap/image4.jpg','images/swap/image5.jpg'];

  /* Cookie functions from http://www.quirksmode.org/js/cookies.html */
  function createCookie(name,value,days) {
      if (days) {
          var date = new Date();
          date.setTime(date.getTime()+(days*24*60*60*1000));
          var expires = "; expires="+date.toGMTString();
      }
      else var expires = "";
      document.cookie = name+"="+value+expires+"; path=/";
  }
 
  function readCookie(name) {
      var nameEQ = name + "=";
      var ca = document.cookie.split(';');
      for(var i=0;i < ca.length;i++) {
          var c = ca[i];
          while (c.charAt(0)==' ') c = c.substring(1,c.length);
          if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
      }
      return null;
  }
 
  var oldWindowOnload=window.onload;
  window.onload=function() {
    oldWindowOnload();
 
    var rightCol = document.getElementById('header');
    if (!rightCol) return false;
 
    var rightColImgs = rightCol.getElementsByTagName('IMG');
    if (!rightColImgs || rightColImgs.length<1) return false;
 
    var rightImgIdx = readCookie("rightImageIndex");
    if (!rightImgIdx) { rightImgIdx=0; } else { rightImgIdx++; }
    if (rightImgIdx > (rightImages.length-1)) rightImgIdx=0;
    createCookie('rightImageIndex',rightImgIdx,1);
 
    rightColImgs[0].src=rightImages[rightImgIdx];
  }