function galleryScroll(){
	var _gallery = "div.gallery-items-holder div.gallery";
	var _leftArrow = "a.btn-prev";
	var _rightArrow = "a.btn-next";
	//var _step = 405;
	var _duration = 1800;
	var _liPadding = 4;
	
	var _gWidth = $(_gallery).width();
	var _liWidth = $(_gallery+" li").width() + _liPadding;
	var _liSum = $(_gallery+" li").length * _liWidth;
	var _margin = 0;
	var f = 0;
	
	_step = _gWidth;
	
	$(_rightArrow).click(function(){
		if (_liSum - _gWidth  <= _margin + _step) {
			if (f == 0) {_margin = _liSum - _gWidth; f = 1;} 
			else {f = 0;}
		} else _margin = _margin + _step;
		$(_gallery+" ul").animate({marginLeft: -_margin+"px"}, {queue:false,duration:_duration });
		checkGallery();
		return false;
	});
	$(_leftArrow).click(function(){
		if (_margin - _step == -_step ) _liPadding;
		else if (_margin - _step < 0 && _margin - _step > -_step) _margin = 0;
		else _margin = _margin - _step;
		$(_gallery + " ul").animate({marginLeft: -_margin + "px"}, {queue:false, duration: _duration});
		checkGallery();
		return false;
	});
	
	checkGallery = function() {
		if (_margin == 0) $(_leftArrow).removeClass('active'); else $(_leftArrow).addClass('active');
		if (_margin == _liSum - _gWidth) $(_rightArrow).removeClass('active'); else $(_rightArrow).addClass('active'); 
	}
}

if (window.addEventListener)
	window.addEventListener("load", galleryScroll, false);
else if (window.attachEvent)
	window.attachEvent("onload", galleryScroll);