window.onerror = null;

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

if(NN3 || NN4 || IE4){

var img_b = new Array();

img_b[1] = new Image(); img_b[1].src = "/common/img/navi/gm01.gif"
img_b[2] = new Image(); img_b[2].src = "/common/img/navi/gm01_over.gif"
img_b[3] = new Image(); img_b[3].src = "/common/img/navi/gm02.gif"
img_b[4] = new Image(); img_b[4].src = "/common/img/navi/gm02_over.gif"
img_b[5] = new Image(); img_b[5].src = "/common/img/navi/gm03.gif"
img_b[6] = new Image(); img_b[6].src = "/common/img/navi/gm03_over.gif"
img_b[7] = new Image(); img_b[7].src = "/common/img/navi/gm04.gif"
img_b[8] = new Image(); img_b[8].src = "/common/img/navi/gm04_over.gif"

img_b[51]= new Image(); img_b[51].src= "/common/img/un01.gif"
img_b[52]= new Image(); img_b[52].src= "/common/img/un01_over.gif"
img_b[53]= new Image(); img_b[53].src= "/common/img/un02.gif"
img_b[54]= new Image(); img_b[54].src= "/common/img/un02_over.gif"
img_b[55]= new Image(); img_b[55].src= "/common/img/un_top.gif"
img_b[56]= new Image(); img_b[56].src= "/common/img/un_top_over.gif"

}

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

function btn_off(nam,num){
if(NN3 || NN4 || IE4) document.images[nam].src = img_b[num].src;
return false;
}