if (parseInt(navigator.appVersion) >= 3) {

 menu01_off = new Image;
 menu01_off.src = "images/menu_off.gif";
 menu01_on = new Image;
 menu01_on.src = "images/menu_on.gif";

 menu02_off = new Image;
 menu02_off.src = "images/menu_off.gif";
 menu02_on = new Image;
 menu02_on.src = "images/menu_on.gif";

 menu03_off = new Image;
 menu03_off.src = "images/menu_off.gif";
 menu03_on = new Image;
 menu03_on.src = "images/menu_on.gif";

 menu04_off = new Image;
 menu04_off.src = "images/menu_off.gif";
 menu04_on = new Image;
 menu04_on.src = "images/menu_on.gif";

 menu05_off = new Image;
 menu05_off.src = "images/menu_off.gif";
 menu05_on = new Image;
 menu05_on.src = "images/menu_on.gif";

 menu06_off = new Image;
 menu06_off.src = "images/menu_off.gif";
 menu06_on = new Image;
 menu06_on.src = "images/menu_on.gif";

 menu07_off = new Image;
 menu07_off.src = "images/menu_off.gif";
 menu07_on = new Image;
 menu07_on.src = "images/menu_on.gif";

 menu08_off = new Image;
 menu08_off.src = "images/menu_off.gif";
 menu08_on = new Image;
 menu08_on.src = "images/menu_on.gif";

}

 function img_act(img_name) {
      if (parseInt(navigator.appVersion) >= 3) {
           img_on = eval(img_name + "_on.src");
           document [img_name].src = img_on;
      }
 }


 function img_inact(img_name) {
      if (parseInt(navigator.appVersion) >= 3) {
           img_off = eval(img_name + "_off.src");
           document [img_name].src = img_off;
      }
 }