/* This script implements HTML5 History states for clients that support it. It parses all links for those beginning in "?"(local), replaces with History-browsing functionality, and onclick updates the "content" div (and reparses accordingly). */
var hist = {
  content: null,
  Go: function() {
    if (window.history.replaceState === undefined) return;
    this.content = document.getElementById("content");
    window.history.replaceState({content: this.content.innerHTML, url: window.location.href, title: document.title}, document.title, window.location.href);
    this.doParse();
    window.onpopstate = this.popState;
  },
  doParse: function(ele) {
    var l = (typeof ele === 'undefined' ? document.getElementsByTagName('A') : ele.getElementsByTagName('A'));
    for (var i = 0; i < l.length; i++) {
      if (!l[i].href) continue;
      if ((l[i].getAttribute("href")).charAt(0) != '?') continue;
      l[i].onclick = function() {
        hist.loadContent(this.getAttribute("href"));
        return false;
      };
    }
    img2popup.doParse(hist.content);
  },
  loadContent: function(target) {
    var r = new XMLHttpRequest();
    r.open("GET", "page.php"+target, true);
    r.onreadystatechange = (function(r, target) { return function() {
      switch (r.readyState) {
        case 4:
          hist.content.innerHTML = r.responseText;
          window.history.pushState({content: r.responseText, url: target, title: document.title}, target, target);
          hist.doParse(hist.content);
        break;
      }
    }})(r, target);
    r.send();
  },
  popState: function(e) {
    if (e.state == null) return;
    hist.content.innerHTML = e.state.content;
    document.title = e.state.title;
    hist.doParse(hist.content);
  }
};