(function($){
	var naviDefault = new Array();
	naviDefault.push([0, 0, 43, 86]);
	naviDefault.push([129, 172, 129, 215]);
	naviDefault.push([258, 301, 344, 258]);
	
	$.fn.fonectanavi = function(naviNum){
		var container = $(this);
		var defaultPosition = getDefaultPosition(naviNum);
		
		$('#navi1_1').mouseover(function(){
			setBackgroundPosition(container, naviNum, 1);
		});
		$('#navi1_2').mouseover(function(){
			setBackgroundPosition(container, naviNum, 2);
		});
		$('#navi1_3').mouseover(function(){
			setBackgroundPosition(container, naviNum, 3);
		});
		
		$('#navi1_1, #navi1_2, #navi1_3').mouseout(function(){
			setBackgroundPosition(container, naviNum, 0);
		});
	}
	
	function setBackgroundPosition(container, naviNum, item){
		var defaultPosition = getDefaultPosition(naviNum);
		var ypos = getItemOffset(naviNum, item);
		$(container).css("background-position", ("0 -" + ypos + "px"));
	}
	
	function getDefaultPosition(naviNum){
		if(naviNum > 0 && naviNum <= naviDefault.length){
			return naviDefault[naviNum - 1][0];
		}
		else
			return naviDefault[0][0];
	}
	
	function getItemOffset(naviNum, item){
		return naviDefault[naviNum - 1][item];
	}
})(jQuery);