var sliderItems = 0;
var sliderCurrentItem = 0;
var sliderInterval;
var sliderEnabled = true;
$(document).ready(function() {
	//determine if a slider div exists
	if ($('#slider').length > 0) {	
		sliderItems = $('#slider-items').find('li').size() ;
		sliderInterval = setInterval(animate,8000);
	}
});
function animate() {
	if(sliderEnabled) {
		sliderEnabled = false;
		$('#slider-items').find('li').eq(sliderCurrentItem).fadeOut("slow", function() {
			sliderCurrentItem = increment(sliderCurrentItem);
			$('#slider-items').find('li').eq(sliderCurrentItem).fadeIn("slow", function() {
				//alert('removing: slider' + decrement(sliderCurrentItem));
				$('#slider-items').removeClass('slider' + decrement(sliderCurrentItem));
				//alert('adding: slider' + sliderCurrentItem); 
				$('#slider-items').addClass('slider' + sliderCurrentItem);
				sliderEnabled = true;
			});
		});
	}
}
function increment(current) {
	if (current + 1 >= sliderItems) {
		return 0;
	} else {
		return current + 1;
	}
}
function decrement(current) {
	if (current - 1 < 0) {
		return sliderItems - 1;
	} else {
		return current - 1;
	}
}