if (((navigator.appName == "Netscape")
                        && (parseInt(navigator.appVersion) >= 3 ))
                        || ((navigator.appName == "Microsoft Internet Explorer")                

                             && (parseInt(navigator.appVersion) >= 4 ))) {
                             version = "supported";
                     }
                             else {
                             version = "notsupported";
                     }
if (version == "supported")
{
                        m_in = new Image(10, 44);
                        m_in.src = "images/i_on.gif";
                        m_out = new Image(10, 44);
                        m_out.src = "images/i_off.gif";
                        }
 
 
    function img_act() {
                        if (version == "supported") {
                        document.images ['bullet'].src = m_in.src;
                        }
                        }
        function img_inact() {
                        if (version == "supported") {
                        document.images ['bullet'].src = m_out.src;
                        }
                        }