/* 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
*/


function ss_fixAllLinks() {
	// 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
			
			if (!lnk.onclick)
			{
				lnk.onclick= function(){return smoothScroll(this);};
			}
		}
	}
}

function smoothScroll(anchor) {
   var destinationLink;

	destinationLink = document.getElementById(anchor.hash.slice(1))
	
 
  // If we didn't find a destination, give up and let the browser do
  // its thing
  if (!destinationLink) return true;
  
  // Find the destination's position
//  var destx = destinationLink.offsetLeft; 
  var desty = destinationLink.offsetTop;
  var thisNode = destinationLink;
  while (thisNode.offsetParent && 
        (thisNode.offsetParent != document.body)) {
    thisNode = thisNode.offsetParent;
//    destx += thisNode.offsetLeft;
    desty += thisNode.offsetTop;
  }
  
  // Stop any current scrolling
  clearInterval(ss_INTERVAL);
  
  cypos = ss_getCurrentYPos();
  
  ss_stepsize = parseInt((desty-cypos)/ss_STEPS);
 
  ss_INTERVAL = setInterval('ss_scrollWindow('+ss_stepsize+','+desty+',"'+anchor+'")',10);
  
  // And stop the actual click happening
 return false;
  
}

function ss_scrollWindow(scramount,dest,anchor) {
 wascypos = ss_getCurrentYPos();
  isAbove = (wascypos < dest);
  window.scrollTo(0,wascypos + scramount);
  iscypos = ss_getCurrentYPos();
  isAboveNow = (iscypos < dest);
  if ((isAbove != isAboveNow) || (wascypos == iscypos)) {
    // if we've just scrolled past the destination, or
    // we haven't moved from the last scroll (i.e., we're at the
    // bottom of the page) then scroll exactly to the link
    window.scrollTo(0,dest);
    // cancel the repeating timer
    clearInterval(ss_INTERVAL);
    // and jump to the link directly so the URL's right
   
  }
 
}

function ss_getCurrentYPos() {
  if (document.body && document.body.scrollTop)
    return document.body.scrollTop;
  if (document.documentElement && document.documentElement.scrollTop)
    return document.documentElement.scrollTop;
  if (window.pageYOffset)
    return window.pageYOffset;
  return 0;
}	

var ss_INTERVAL;
var ss_STEPS = 15;