var version = 0;
   
        if (navigator.userAgent.indexOf("Mozilla/4.") != -1) version = 4;
        else if (navigator.userAgent.indexOf("Mozilla/3.") != -1) version = 3;
        else if (navigator.userAgent.indexOf("Mozilla/2.") != -1) version = 2;
        else if (navigator.userAgent.indexOf("MSIE") != -1) version = 1;
        else version = 0;
   
        if (version >= 3)
        {
        s_menu0on = new Image();
        s_menu0on.src = "images/nav_home_on.gif";
        s_menu1on = new Image();
        s_menu1on.src = "images/nav_about_on.gif";
        s_menu2on = new Image();
        s_menu2on.src = "images/nav_services_on.gif";
        s_menu3on = new Image();
        s_menu3on.src = "images/nav_contact_on.gif";
            

        s_menu0off = new Image();
        s_menu0off.src = "images/nav_home_off.gif";
        s_menu1off = new Image();
        s_menu1off.src = "images/nav_about_off.gif";
        s_menu2off = new Image();
        s_menu2off.src = "images/nav_services_off.gif";
        s_menu3off = new Image();
        s_menu3off.src = "images/nav_contact_off.gif";
        s_menu4off = new Image();         
   
        
             

       }