window.addEvent('domready', function() {

	function resetNavItems(){
		var prevText = (currSet == 0) ? "up-disabled":"up";
		var nextText = (currSet == totalSets-1) ? "down-disabled":"down";
		$('next_link').set('style', 'background: url(images/work-scroll-'+ nextText +'.jpg) no-repeat;');
		$('prev_link').set('style', 'background: url(images/work-scroll-'+ prevText +'.jpg) no-repeat;');	
	}
	
	var currSet = 0;	
	var totalSets = $('wrapthumbs').getChildren().length;
	
	resetNavItems();
	
	if (totalSets < 0) totalSets = 0;
	
	var myScroll = new Fx.Scroll('thumb-spill',{
	
					offset:{'x': 0, 'y': 0},
					wait: false,
					duration: 600,
					transition: Fx.Transitions.Expo.easeInOut
					
					});

	$('next_link').addEvent('click', function(e) {
					
					e.stop();
					
					if (currSet < totalSets -1 )
					{
						currSet ++;
						var scrollElement = 'thumbset'+ (currSet);
						myScroll.toElement(scrollElement);
						resetNavItems();
					}
					
				});
	
	$('prev_link').addEvent('click', function(e) {
					
					e.stop();
					
					if (currSet > 0)
					{
						currSet --;
						var scrollElement = 'thumbset'+ (currSet);
						myScroll.toElement(scrollElement);
						resetNavItems();
					}
					
				});

	
});