var is_animating = false;

$(document).ready(function(){
	$('.portfolio_slider .scroll_left').click(function(){
		moveSliderLeft();
	});
	
	$('.portfolio_slider .scroll_right').click(function(){
		moveSliderRight();
	});
	
	$('.portfolio_slider .items').mousewheel(function(event, delta){
		event.preventDefault();
		if (delta > 0) {
			moveSliderLeft();
		} else {
			moveSliderRight();
		}
	});
	var left = $('.portfolio_slider .items').scrollLeft();
	if (left > 0) {
		$('.portfolio_slider .scroll_left').show(500);
		var max_left = $('.portfolio_slider .items table').width() - $('.portfolio_slider .items').width();
		if (left >= max_left) {
			$('.portfolio_slider .scroll_right').hide(500);
		}
	}
});

function moveSliderLeft() {
	if (is_animating) return;
	var left = $('.portfolio_slider .items').scrollLeft();
	if (left) {
		left -= $('.portfolio_slider .items').width();
		if (left < 0) left = 0;
		if (left == 0) {
			$('.portfolio_slider .scroll_left').hide(500);
		}
		$('.portfolio_slider .scroll_right').show(500);
		is_animating = true;
		$('.portfolio_slider .items').scrollTo(left, 700, function(){
			is_animating = false;
		});
	}
}

function moveSliderRight() {
	if (is_animating) return;
	var left = $('.portfolio_slider .items').scrollLeft();
	var max_left = $('.portfolio_slider .items table').width() - $('.portfolio_slider .items').width();
	if (left != max_left) {
		left += $('.portfolio_slider .items').width();
		if (left > max_left) left = max_left;
		if (left == max_left) {
			$('.portfolio_slider .scroll_right').hide(500);
		}
		$('.portfolio_slider .scroll_left').show(500);
		is_animating = true;
		$('.portfolio_slider .items').scrollTo(left, 700, function(){
			is_animating = false;
		});
	}
}