function preLoad(){
				var img0 = new Image();
				img0.src = "../common/icon_ke.gif";
				var img1 = new Image();
				img1.src = "../common/icon_txt.png"; 
				var img2 = new Image();
				img2.src = "../common/icon_ke_r.gif";
				var img3 = new Image();
				img3.src = "../common/icon_txt_r.png"; 
			}
			
			function txtOn(){
				document.images['t_d'].src = "../common/icon_txt_r.png";	}
			function txtOff(){
				document.images['t_d'].src = "../common/icon_txt.png"; }

			function keOn1(){
				document.images['ke'].src = "../common/icon_ke_r.gif"; }
			function keOff1(){
				document.images['ke'].src = "../common/icon_ke.gif"; }				
			function keOn2(){
				document.images['ke'].src = "../common/icon_ke_r.gif"; }
			function keOff2(){
				document.images['ke'].src = "../common/icon_ke.gif"; }
			
			var i=120
			function ScrDN(){
				if(i<524){
					i=i+48; window.scroll(0,i); setTimeout("ScrDN()",5)
				}else{ i=120; }
			}