preloadIMG = new Array();
			for(i=1;i<=18;i++){
				preloadIMG = new Image();
				preloadIMG.src = "images/navi_"+i+".gif";
			}
			
			function btnOn(a){
				document["navi_"+a].src = "images/navi_"+a+"_on.gif";
			}
			function btnOff(b){
				document["navi_"+b].src = "images/navi_"+b+".gif";
			}
			
preloadIMG = new Array();
			for(i=1;i<=18;i++){
				preloadIMG = new Image();
				preloadIMG.src = "../common/navi_"+i+".gif";
			}
			
			function btnOn(a){
				document["navi_"+a].src = "../common/navi_"+a+"_on.gif";
			}
			function btnOff(b){
				document["navi_"+b].src = "../common/navi_"+b+".gif";
			}