function getElement(name) {
         if (parseInt(navigator.appVersion) >= 4 && navigator.userAgent.indexOf("MSIE") != -1) {
             return eval("document.all." + name + ".style");
         }
         else if (parseInt(navigator.appVersion) == 4 && navigator.appName == "Netscape") {
                  return eval("document.layers." + name);
         }
         else if (parseInt(navigator.appVersion) >= 5 && navigator.appName == "Netscape") {
                  return document.getElementById(name).style;
         }
}

<!-- Fonctions globales de visu des Layers -->

function MM_openBrWindow(theURL,winName,features) { //v2.0
  window.open(theURL,winName,features);
}

function show(name) {
  getElement(name).visibility = "visible";
  getElement(name).left = img_mnu0.left;
}         

function hide(name) {
  getElement(name).visibility = "hidden";
}

function killAll() {
  hide('mnu0');
  hide('mnu1');
  hide('mnu2');
  hide('mnu3');
}

<!-- Fonction globale liées aux Images -->

function MM_preloadImages() {
  var d=document; 
  if(d.images){ 
    if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; 
    for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ 
      d.MM_p[j]=new Image; 
      d.MM_p[j++].src=a[i];
    }
   }
}

function MM_swapImgRestore() {
  var i,x,a=document.MM_sr; 
  for(i=0 ; a&&i<a.length&&(x=a[i])&&x.oSrc ; i++) x.src=x.oSrc;
}

function MM_findObj(n, d) {
  var p,i,x;
  if(!d) d=document;
  if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; 
    n=n.substring(0,p);
  }
  if(!(x=d[n])&&d.all) x=d.all[n];
  for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  return x;
}

function MM_swapImage() {
  var i,j=0,x,a=MM_swapImage.arguments;
  document.MM_sr=new Array;
  for(i=0;i<(a.length-2);i+=3)
  if ((x=MM_findObj(a[i]))!=null) {
    document.MM_sr[j++]=x;
    if(!x.oSrc) x.oSrc=x.src;
    x.src=a[i+2];
  }
}