var TF = window.TF || {};
  
 /* -------------------------------------------------------------------------- */
 /* Functions to initialize and perform the scrolling anchor links. */
 /* -------------------------------------------------------------------------- */
  
 TF.Scroller = function () {
  
 var stepIncrement = 50;// The number of pixels that each step moves the window.
 var stepDelay = 10;// The number of milliseconds between steps.
 var limit = 6 * 1000;// After 6 seconds the scroll is killed.
 
 var running = false;
 
 /* Recursive scrolling method. Steps through the complete scroll. */
 
 function scrollStep(to, dest, down) {
 
 if(!running || (down && to >= dest) || (!down && to <= dest)) {
 TF.Scroller.killScroll();
 return;
 }
 
 if((down && to >= (dest - (2 * stepIncrement))) ||
 (!down && to <= (dest - (2 * stepIncrement)))) {
 stepIncrement = stepIncrement * .55;
 }
 
 window.scrollTo(0, to);
 
 // Assign the returned function to a public method.
 TF.Scroller.nextStep = callNext(+to + stepIncrement, dest, down);
 window.setTimeout(TF.Scroller.nextStep, stepDelay);
 }
 
 /* Create a closure so that scrollStep can be accessed by window.setTimeout(). */
 
 function callNext(to, dest, down) {
 
 return function() { scrollStep(to, dest, down); };
 }
 
 return {
 
 nextStep: null,
 killTimeout: null,
 
 /* Sets up and calls scrollStep. */
 
 /* Sets up and calls scrollStep. */
 
 anchorScroll: function(e, obj)
 {
	 var clickedLink = YAHOO.util.Event.getTarget(e);
	 try
	 {
		 var anchorId = clickedLink.href.replace(/^.*#/, '');
		 if(anchorId.match(/.*\.(gif|png|jpg|jpeg)$/))
		 {
			anchorId = String(clickedLink.parentNode).replace(/^.*#/,'');
			alert(anchorId);
		 }
	}
	catch(e)
	{
		var anchorId = String(clickedLink.parentNode).replace(/^.*#/,'');
	}
	
	anchorId = String(anchorId);
	var target = YAHOO.util.Dom.get(anchorId);
 if(target) {
 YAHOO.util.Event.stopEvent(e);
 running = true;
 
 var yCoord = ((YAHOO.util.Dom.getY(target) - 6) < 0) ? 0 : YAHOO.util.Dom.getY(target) - 6;
 var currentYPosition = (document.all) ? document.body.scrollTop : window.pageYOffset;
 var down = true;
 
 if(currentYPosition > yCoord) {
 stepIncrement *= -1;// Reverse the direction if we are scrolling up.
 down = false;
 }
 
 // Stop the scroll once the time limit is reached.
 TF.Scroller.killTimeout = window.setTimeout(TF.Scroller.killScroll, limit);
 
 // Start the scroll by calling scrollStep().
 scrollStep(currentYPosition + stepIncrement, yCoord, down);
 }
 },
 
 /* Kill the scroll after a timeout, to prevent an endless loop. */
 
 killScroll: function() {
 window.clearTimeout(TF.Scroller.killTimeout);
 running = false;
 stepIncrement = 50;
 },
 
 /* Attach the scrolling method to the links with the class 'scrolling-link'. */
 
 init: function() {
 
 var links = YAHOO.util.Dom.getElementsByClassName('scrolling-link', 'a');
 YAHOO.util.Event.addListener(links, 'click', TF.Scroller.anchorScroll, TF.Scroller, true);
 }
 }
  
} ();
 
YAHOO.util.Event.onAvailable('copyright', TF.Scroller.init, TF.Scroller, true);