var ver4 = (navigator.appVersion.charAt(0) >= "4");
var NN4  = ver4 && (navigator.appName == "Netscape");
var IE4 = ver4 && (navigator.appName.charAt(0) == "M");
var NN3 = ((navigator.appVersion.charAt(0) == "3") && (navigator.appName == "Netscape"));


function In(nam,num) {
        if(NN3 || NN4 || IE4) document.images[nam].src = menu[num].src;
}

function Out(nam,num) {
        if(NN3 || NN4 || IE4) document.images[nam].src = menu[num].src;
}    

if(NN3 || NN4 || IE4){
        var menu = new Array();
        menu[0] = new Image();  menu[0].src = "/imgs/head_menu_top_b.gif";
        menu[1] = new Image();  menu[1].src = "/imgs/head_menu_top.gif";
        menu[2] = new Image();  menu[2].src = "/imgs/head_menu_flow_b.gif";
        menu[3] = new Image();  menu[3].src = "/imgs/head_menu_flow.gif";
        menu[4] = new Image();  menu[4].src = "/imgs/head_menu_yakkan_b.gif";
        menu[5] = new Image();  menu[5].src = "/imgs/head_menu_yakkan.gif";
        menu[6] = new Image();  menu[6].src = "/imgs/head_menu_company_b.gif";
        menu[7] = new Image();  menu[7].src = "/imgs/head_menu_company.gif";
        menu[8] = new Image();  menu[8].src = "/imgs/head_menu_map_b.gif";
        menu[9] = new Image();  menu[9].src = "/imgs/head_menu_map.gif";
}