//preload
function preload(){
	if (navigator.appVersion.charAt(0) >= "3") {
		for(idx=0; idx<imgname.length; idx++) {
			img[idx]=new Image();
			img[idx].src=preload_dir+imgname[idx];
		}
	}
}
//rollover
function menurollover(nam,o,arwsw){
	arwnm = nam+"arw";
	if (navigator.appVersion.charAt(0) >= "3"){
		document.images[nam].src=rollover_dir+o;
		if(arwsw) {
			document.images[arwnm].src=rollover_dir+"c_menu_arw_on.gif";
		} else {
			document.images[arwnm].src=rollover_dir+"c_menu_arw.gif";
		}
	}
}

//rollover
function linkrollover(nam,o){
	if (navigator.appVersion.charAt(0) >= "3"){
		document.images[nam].src=rollover_dir+o;
	}
}

//rollover
function navirollover(nam,o,navisw,arwsw){
	navinm = nam+"arw";
	if (navigator.appVersion.charAt(0) >= "3"){
		document.images[nam].src=rollover_dir+o;
		if(navisw) {
			if(arwsw) {	// left
				document.images[navinm].src=rollover_dir+"c_navi_arw_left_on.gif";
			} else {	// right
				document.images[navinm].src=rollover_dir+"c_navi_arw_right_on.gif";
			}
		} else {
			if(arwsw) {	// left
				document.images[navinm].src=rollover_dir+"c_navi_arw_left.gif";
			} else {	// right
				document.images[navinm].src=rollover_dir+"c_navi_arw_right.gif";
			}
		}
	}
}