ie4 = ((navigator.appName == "Microsoft Internet Explorer") && (parseInt(navigator.appVersion) >= 4 ))
ns4 = ((navigator.appName == "Netscape") && (parseInt(navigator.appVersion) >= 4 ))

if (ns4) {
layerRef="document.layers";
styleRef="";
} else {
layerRef="document.all";
styleRef=".style";
}
function cacheCalque(calque)
{
eval(layerRef + '["' + calque +'"]' + styleRef + '.visibility = "hidden"');
}
function cacheCalques()
{
cacheCalque('hg1');
cacheCalque('bg1');
cacheCalque('hd1');
cacheCalque('bd1');
}

function afficheCalque(calque)
{
cacheCalques();
eval(layerRef + '["' + calque +'"]' + styleRef + '.visibility = "visible"');

}

function cacheCalques2()
{
cacheCalque('hg1');
cacheCalque('bg1');
cacheCalque('hd1');
}

function afficheCalque2(calque)
{
cacheCalques2();
eval(layerRef + '["' + calque +'"]' + styleRef + '.visibility = "visible"');

}

function cacheCalques3()
{
cacheCalque('hg1');
cacheCalque('bg1');
}

function afficheCalque3(calque)
{
cacheCalques3();
eval(layerRef + '["' + calque +'"]' + styleRef + '.visibility = "visible"');
}

function afficheCalque1(calque)
{
eval(layerRef + '["' + calque +'"]' + styleRef + '.visibility = "visible"');
}

function MM_findObj(n, d) { //v4.01
  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);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}
function MM_showHideLayers() { //v6.0
  var i,p,v,obj,args=MM_showHideLayers.arguments;
  for (i=0; i<(args.length-2); i+=3) if ((obj=MM_findObj(args[i]))!=null) { v=args[i+2];
    if (obj.style) { obj=obj.style; v=(v=='show')?'visible':(v=='hide')?'hidden':v; }
    obj.visibility=v; }
}

function PopupCentrer(page,largeur,hauteur,options) {
var top=(screen.height-hauteur)/2;
var left=(screen.width-largeur)/2;
window.open(page,"","top="+top+",left="+left+",width="+largeur+",height="+hauteur+","+options);
}