/* Smooth scrolling, based on 
   
   sil, http://www.kryogenix.org/
   
*/

var SmoothScroll = 
{
  smoothScroll: function( anchor )
  {
    // Now loop all A tags until we find one with that name
    var allLinks = document.getElementsByTagName('a');
    var destinationLink = null;
    for (var i=0;i<allLinks.length;i++) 
	{
      var lnk = allLinks[i];
      if (lnk.name && (lnk.name == anchor)) 
	  {
        destinationLink = lnk;
        break;
      }
    }
    if (!destinationLink) destinationLink = document.getElementById(anchor);

    // 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(SmoothScroll.INTERVAL);
  	
    cypos = SmoothScroll.getCurrentYPos();
  	
    ss_stepsize = parseInt((desty-cypos)/SmoothScroll.STEPS);
    SmoothScroll.INTERVAL =
setInterval('SmoothScroll.scrollWindow('+ss_stepsize+','+desty+',"'+anchor+'")',10);
  },

  scrollWindow: function(scramount,dest,anchor) 
  {
    wascypos = SmoothScroll.getCurrentYPos();
    isAbove = (wascypos < dest);
    window.scrollTo(0,wascypos + scramount);
    iscypos = SmoothScroll.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(SmoothScroll.INTERVAL);
      // and jump to the link directly so the URL's right
      // location.hash = anchor;
    }
  },

  getCurrentYPos: function() 
  {
    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;
  }
}

SmoothScroll.STEPS = 25;