function prepareswap() {
  if (document.getElementById && document.getElementsByTagName) {
    var div = document.getElementById("thumbnails");
    var ll = div.getElementsByTagName("a");
    var i;
    for (i=0; i<ll.length; ++i) {
      var str = ll[i].href;
      if (str.indexOf("movie")==-1) {
        str = unescape(str.substring(str.lastIndexOf("=")+1,str.length));
        var filename = str;
        // alert("Using filename = "+filename);
        ll[i].href = "javascript:swapImage('"+filename+"')";
      }
    }
  }
}

function prepareswap2() {
  if (document.getElementById && document.getElementsByTagName) {
    var div = document.getElementById("thumbnails");
    var ll = div.getElementsByTagName("a");
    var i;
    for (i=0; i<ll.length; ++i) {
      var str = ll[i].href;
      str = unescape(str.substring(str.lastIndexOf("=")+1,str.length));
      var filename = str;
      // alert("Using filename = "+filename);
      ll[i].href = "javascript:swapBackground('"+filename+"')";
    }
  }
}

function MM_preloadImages() { //v3.0
    var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
          var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
                if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function swapImage(filename) {
   var img; if ((img=document.getElementById("primary_img"))!=null){img.src=filename;}
}

function swapBackground(filename) {
    var img; if ((img=document.getElementById("img1"))!=null) {
      img.style.background="url("+filename+") 50% 50% no-repeat"; }
}