Some fun w/ HTML5's history API

html5_history_fun.js

var original_url = window.location.href
var to_be_changed_url = "blah blah url"
history.pushState(null, null, '/foo.html');
window.onpopstate = function(e){
  if(e.state){
   history.pushState(null, null, original_url);
  }
  //window.location.href = to_be_changed_url;
};
document.onkeydown = function() {
  switch (event.keyCode) {
    case 116 : //F5 button
      history.pushState(null, null, original_url);
      window.location.reload();
    case 82 : //R button
      if (event.ctrlKey) {
        history.pushState(null, null, original_url);
        window.location.reload();
      }
  }
}