var mainConNum = 1;

	function changeMainCon(arrow)  {
	
		if (arrow == "left") { 

			var d = $("layerMainTitle" + mainConNum);
			d.hide();
			if(eval($("layerMainTitle" + 3))){
				if (mainConNum == 1) {
					mainConNum = 3;
				} else {
					mainConNum = mainConNum - 1;
				}			
			}else if(eval($("layerMainTitle" + 2))){
				if (mainConNum == 1) {
					mainConNum = 2;
				} else {
					mainConNum = mainConNum - 1;
				}			
			}

			var d = $("layerMainTitle" + mainConNum);
			if(!eval(d)){		//1,3¸¸ Á¸ÀçÇÒ °æ¿ì 3¿¡¼­ 1·Î ³Ñ¾î°¡±â
				mainConNum=mainConNum-1;
			}
			
			d = $("layerMainTitle" + mainConNum);
			d.show();
			
		} else {
		
			var d = $("layerMainTitle" + mainConNum);
			d.hide();
			if(eval($("layerMainTitle" + 3))){
				if(mainConNum == 3) {
					mainConNum = 1;
				} else {
					mainConNum = mainConNum + 1;
				}
			}else if(eval($("layerMainTitle" + 2))){
				if(mainConNum == 2) {
					mainConNum = 1;
				} else {
					mainConNum = mainConNum + 1;
				}
			}

			var d = $("layerMainTitle" + mainConNum);
			if(!eval(d)){		//2,3¸¸ Á¸ÀçÇÒ °æ¿ì 3¿¡¼­ 2·Î ³Ñ¾î°¡±â
				mainConNum=mainConNum+1;
			}
			
			d = $("layerMainTitle" + mainConNum);
			d.show();
		
		}
	
		convert_update_img(mainConNum);
	
	}	

	
	function convert_show(t_gubun) {
		
		for (i=1;i<=3;i++) {
		    var d = $("layerMainTitle"+i);
		    d.hide();
		}
		
		var d = $("layerMainTitle"+t_gubun);
		
		document.getElementById("layerMainTitle2").filters[0].apply();
		d.show();
		document.getElementById("layerMainTitle2").filters[0].play();
		//d.filters.apply();
		//d.filters.play();
		//d.show();		
		
	}
	

	function convert_update_img(t_gubun) {
		
		if (t_gubun==1) {
	
			document.update_img1.src = "img/no1_on.gif";
			document.update_img2.src = "img/no2_off.gif";
			document.update_img3.src = "img/no3_off.gif";
		
		} else if (t_gubun==2) {
			
			document.update_img1.src = "img/no1_off.gif";
			document.update_img2.src = "img/no2_on.gif";
			document.update_img3.src = "img/no3_off.gif";		
			
		} else if (t_gubun==3) {
		
			document.update_img1.src = "img/no1_off.gif";
			document.update_img2.src = "img/no2_off.gif";
			document.update_img3.src = "img/no3_on.gif";			
			
		}
		
		convert_show(t_gubun);
	
	}


	function convert_update_img_main(t_gubun) {
		
		if (t_gubun==1) {
	
			document.update_img1.src = "img/ko/1_on.gif";
			document.update_img2.src = "img/ko/2_off.gif";
			document.update_img3.src = "img/ko/3_off.gif";
		
		} else if (t_gubun==2) {
			
			document.update_img1.src = "img/ko/1_off.gif";
			document.update_img2.src = "img/ko/2_on.gif";
			document.update_img3.src = "img/ko/3_off.gif";		
			
		} else if (t_gubun==3) {
		
			document.update_img1.src = "img/ko/1_off.gif";
			document.update_img2.src = "img/ko/2_off.gif";
			document.update_img3.src = "img/ko/3_on.gif";			
			
		}
		
		convert_show(t_gubun);
	
	}