var ver4 = (navigator.appVersion.charAt(0) == "4");
        var NN4  = ver4 && (navigator.appName == "Netscape");
        var IE4 = ver4 && (navigator.appName.charAt(0) == "M");
        var NN3 = ((navigator.appVersion.charAt(0) == "3") && (navigator.appName == "Netscape"));

  if(NN3 || NN4 || IE4){
    var imgMof = new Array();
    var imgMon = new Array();
    imgMof[0] = new Image();  imgMof[0].src = "image-password/loupiasoff.gif";
    imgMon[0] = new Image();  imgMon[0].src = "image-password/loupiason.gif";
 }
  function Min(name,num) {
  if(NN3 || NN4 || IE4){
        document.images[name].src = imgMon[num].src;
    }
  }

  function Mout(name,num) {
   if(NN3 || NN4 || IE4){
        document.images[name].src = imgMof[num].src;
    }
  }