/* Smooth scrolling
   Changes links that link to other parts of this page to scroll
   smoothly to those links rather than jump to them directly, which
   can be a little disorienting.

   sil, http://www.kryogenix.org/

   v1.0 2003-11-11
   v1.1 2005-06-16 wrap it up in an object
*/
var myElement;
var myTransition;
var myFx;
var ss = {
  fixAllLinks: function() {
	myElement = $(document.body);
	myTransition = new Fx.Transition(Fx.Transitions.Quad, 3);
	myFx = new Fx.Scroll(myElement,{transition: myTransition.easeOut, duration: 2000})
    // Get a list of all links in the page
    var allLinks = document.getElementsByTagName('a');
    // Walk through the list
    for (var i=0;i<allLinks.length;i++) {
      var lnk = allLinks[i];
      if ((lnk.href && lnk.href.indexOf('#') != -1) && 
          ( (lnk.pathname == location.pathname) ||
	    ('/'+lnk.pathname == location.pathname) ) && 
          (lnk.search == location.search)) {
        // If the link is internal to the page (begins in #)
        // then attach the smoothScroll function as an onclick
        // event handler
        ss.addEvent(lnk,'click',ss.smoothScroll);
      }
    }
  },

  smoothScroll: function(e) {
	if (window.event) {
      target = window.event.srcElement;
    } else if (e) {
      target = e.target;
    } else return;
    if (target.nodeType == 3 || target.hash == null) {
      target = target.parentNode;
    }
	anchor = target.hash.substr(1);
	
	var c = getAnchorPosition(anchor);
	posy = c.y;
	myFx.cancel();
	myFx.start(0, posy);
	if (window.event) {
      window.event.cancelBubble = true;
      window.event.returnValue = false;
    }
    if (e && e.preventDefault && e.stopPropagation) {
      e.preventDefault();
      e.stopPropagation();
    }
  },
	  
  addEvent: function(elm, evType, fn, useCapture) {
    // addEvent and removeEvent
    // cross-browser event handling for IE5+,  NS6 and Mozilla
    // By Scott Andrew
    if (elm.addEventListener){
      elm.addEventListener(evType, fn, useCapture);
      return true;
    } else if (elm.attachEvent){
      var r = elm.attachEvent("on"+evType, fn);
      return r;
    } else {
      alert("Handler could not be removed");
    }
  } 
}
ss.addEvent(window,"load",ss.fixAllLinks);