var _CURRENT_PAGE;
var _TOT_IMG;
var _PAGES;

function setScrollGallery() {
	
	_CURRENT_PAGE = 0;
	_TOT_IMG      = $$("#gallery img").length;
	_PAGES        = Math.ceil(_TOT_IMG/4);
	
	$("prev").setStyle('display', 'none');
	if (_PAGES > 1) {
		$("next").setStyle('display', 'block');
	} else {
		$("next").setStyle('display', 'none');
	}
	
	$("prev").addEvent("click", function() { goScrollGalleryPrev(); });
	$("next").addEvent("click", function() { goScrollGalleryNext(); });
	
}

function goScrollGalleryNext() {
	
	$("prev").removeEvents('click');
	$("next").removeEvents('click');
	
	_CURRENT_PAGE++;
	
	if ((_CURRENT_PAGE+1) >= _PAGES) {
		$("next").setStyle('display', 'none');
	}
	$("prev").setStyle('display', 'block');
	
	var posNow = $('galleryScroll').getStyle('left').toInt();
	
	var slide = new Fx.Style('galleryScroll', 'left', {
		duration:   1200,
		transition: Fx.Transitions.Cubic.easeOut
	});
	slide.addEvent('onComplete', function() {
		$("prev").addEvent("click", function() { goScrollGalleryPrev(); });
		$("next").addEvent("click", function() { goScrollGalleryNext(); });
	});
	slide.start(posNow, posNow-604);
	
}

function goScrollGalleryPrev() {
	
	$("prev").removeEvents('click');
	$("next").removeEvents('click');
	
	_CURRENT_PAGE--;
	
	if (_CURRENT_PAGE <= 0) {
		$("prev").setStyle('display', 'none');
	}
	$("next").setStyle('display', 'block');
	
	var posNow = $('galleryScroll').getStyle('left').toInt();
	
	var slide = new Fx.Style('galleryScroll', 'left', {
		duration:   1200,
		transition: Fx.Transitions.Cubic.easeOut
	});
	slide.addEvent('onComplete', function() {
		$("prev").addEvent("click", function() { goScrollGalleryPrev(); });
		$("next").addEvent("click", function() { goScrollGalleryNext(); });
	});
	slide.start(posNow, posNow+604);
	
}