// JavaScript Document
function preloadImages() { 
  var d = document.images; var s, p; var y = 1;
  for(var x=0;x<d.length;x++) {s = new String(d[x].src);
    if(s.indexOf('_off')!=-1) { p = s.replace(/_off/g, "_on");
      d[d.length+y] = new Image(); d[d.length+y].src = p; y++; 
      self.status = 'preloading : ' + p; }} self.status = '';
} 

function swap(i) { 
  var e = document.images[i];
  var s = new String(e.src);
  e.src=(s.indexOf('_off')==-1? s = s.replace(/_on/g, '_off'): s = s.replace(/_off/g, '_on'));
  //alert(e.src);
}