browseName = navigator.appName;
                     browseVer = parseInt(navigator.appVersion);
                     
                 if ((browseName == "Netscape" && browseVer >= 3) || (browseName != "Netscape" && browseVer >=4))
                     {
                     torna_off = new Image(73,24);
                     torna_off.src = 'radiorigamini.gif';
                     torna_on = new Image(73,24);
                     torna_on.src = 'radiorigaminihi.gif';
                     }

                 function actImg(imgName)
                     {
                      if ((browseName == "Netscape" && browseVer >= 3) || (browseName != "Netscape" && browseVer >=4))
                          {
                        imgOn = eval(imgName + '_on.src');
                        document [imgName].src = imgOn;
                          }
                     }

                 function inactImg(imgName)
                     {
                      if ((browseName == "Netscape" && browseVer >= 3) || (browseName != "Netscape" && browseVer >=4))
                          {
                        imgOff = eval(imgName + '_off.src');
                        document [imgName].src = imgOff;
                          }
                     }