function galleryScroll(){
	var _gallery = "#gallery div";
	var _leftArrow = "#gallery .btn-prev";
	var _rightArrow = "#gallery .btn-next";
	//var _step = 405;
	var _duration = 1200;
	var _liPadding = 0;
	
	var _gWidth = $(_gallery).width() + _liPadding ;
	var _liWidth = $(_gallery+" li").width() + _liPadding;
	var _liSum = $(_gallery+" li").length * _liWidth;
	var _margin = 0;
	var f = 0;
	
	_step = _liWidth;
	
	$(_rightArrow).click(function(){
		if (_liSum - _gWidth  <= _margin + _step) {
			if (f == 0) {_margin = _liSum - _gWidth; f = 1;} 
			else {_margin = 0;f = 0;}
		} else _margin = _margin + _step;
		$(_gallery+" ul").animate({marginLeft: -_margin+"px"}, {queue:false,duration:_duration });
		return false;
	});
	$(_leftArrow).click(function(){
		_margin = _margin - _step;
		if (_margin < 0) _margin = 0;
		$(_gallery + " ul").animate({marginLeft: -_margin + "px"}, {queue:false, duration: _duration});
		return false;
	});
}

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