if (document.images){

             menu_a_0 = new Image(100,30);
             menu_a_0.src = "jwa.gif";
             menu_a_1 = new Image(100,30);
             menu_a_1.src = "jwa(-).gif";

             menu_b_0 = new Image(100,30);
             menu_b_0.src = "win.gif";
             menu_b_1 = new Image(100,30);
             menu_b_1.src = "win(-).gif";

             menu_c_0 = new Image(100,30);
             menu_c_0.src = "gra.gif";
             menu_c_1 = new Image(100,30);
             menu_c_1.src = "gra(-).gif";

             menu_d_0 = new Image(100,30);
             menu_d_0.src = "adv.gif";
             menu_d_1 = new Image(100,30);
             menu_d_1.src = "adv(-).gif";

             menu_e_0 = new Image(100,30);
             menu_e_0.src = "cont.gif";
             menu_e_1 = new Image(100,30);
             menu_e_1.src = "cont(-).gif";

}

     function giFlip(imgName, mouseMov){
       if (document.images){

         if (mouseMov == "over"){
            document [imgName].src = eval("menu_" + imgName + "_1.src");
         }

         if (mouseMov == "out"){
            document [imgName].src = eval("menu_" + imgName + "_0.src");
         }
       }
     }