function globGalleryPosition() {
	var selected = $("ul.nahlady").children("li.activeImage");
	var currentIndex = $("ul.nahlady").children("li").index(selected);
	var currentPosition = -1 * currentIndex * 80;
	currentPosition = currentPosition + "px";
	$("ul.nahlady").css("top",currentPosition);
}

function globGalleryNext() {
	var selected = $("ul.nahlady").children("li.activeImage");
	var newLi = selected.next();

	if( newLi.length < 1 ) {
		newLi = $("ul.nahlady").children("li").first();
	}
	globGalleryElement(newLi);
}

function globGalleryPrevious( element ) {
	var selected = $("ul.nahlady").children("li.activeImage");
	var newLi = selected.prev();

	if( newLi.length < 1 ) {
		newLi = $("ul.nahlady").children("li").last();
	}
	globGalleryElement(newLi);
}

function globGalleryElement( element ) {
	$("ul.nahlady").children("li").removeClass("activeImage");
	$(element).addClass("activeImage");
	var newImage = $(element).children("img.thumb");	
	$("#img_main_image").attr("src",newImage.attr("src"));
	globGalleryPosition();
}

$(document).ready( 
		function () {
			$("li").click( function() { globGalleryElement($(this)); } );
			$("#img_main_image").click( globGalleryNext );
			$("div#up").click( globGalleryPrevious );
			$("div#down").click( globGalleryNext );
		}
);