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"));
if(NN3 || NN4 || IE4){
var imgS = new Array();
imgS[10] = new Image(); imgS[10].src = "image/menu/subtn01.gif";
imgS[11] = new Image(); imgS[11].src = "image/menu/subtn01r.gif";
imgS[20] = new Image(); imgS[20].src = "image/menu/subtn02.gif";
imgS[21] = new Image(); imgS[21].src = "image/menu/subtn02r.gif";
imgS[30] = new Image(); imgS[30].src = "image/menu/subtn03.gif";
imgS[31] = new Image(); imgS[31].src = "image/menu/subtn03r.gif";
}

function Six(plc,num,nam) {
if(NN3 || NN4 || IE4) {
              box=num*10+nam;
              document.images["S"+plc].src = imgS[box].src;
              }
}