function MM_reloadPage(init) {  //reloads the window if Nav4 resized
  if (init==true) with (navigator) {if ((appName=="Netscape")&&(parseInt(appVersion)==4)) {
    document.MM_pgW=innerWidth; document.MM_pgH=innerHeight; onresize=MM_reloadPage; }}
  else if (innerWidth!=document.MM_pgW || innerHeight!=document.MM_pgH) location.reload();
}
MM_reloadPage(true);
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_setTextOfLayer(objName,x,newText) { //v4.01
  if ((obj=MM_findObj(objName))!=null) with (obj)
    if (document.layers) {document.write(unescape(newText)); document.close();}
    else innerHTML = unescape(newText);
}

function win_size()
{
	
	var Mynav = navigator.appName;
	ns = (Mynav == 'Netscape') ? 1:0;
	ie = (Mynav == 'Microsoft Internet Explorer') ? 1:0;
   var w_s=new Array(2);
   w_s[0]=100; // width
   w_s[1] =100; // height
   w_s[2] =100; // scrollTop
   

      if (ns) 
      {
         w_s[0]= window.innerWidth; // width
         w_s[1] = window.innerHeight; // height
		 w_s[2] = window.pageYOffset; // scrollTop
      }
      if(ie) 
      {
         w_s[0] = document.body.offsetWidth;
         w_s[1] = document.body.offsetHeight;
		 w_s[2] = document.documentElement.scrollTop; // scrollTop
      }

   return w_s;
}

function ouvertureplan(div1, div2){

			 var w_s=win_size();
			 var lardiv=parseInt(document.getElementById(div1).style.width)*1;
 
               document.getElementById(div1).style.left=Math.floor(w_s[0]/2)-parseInt(lardiv/2)+'px'; 
			   document.getElementById(div1).style.display = 'block';
			   
			   document.getElementById(div2).style.left=Math.floor(w_s[0]/2)-parseInt(lardiv/2)+'px'; 
			   document.getElementById(div2).style.display = 'block';
 }

<!--
function winOpen(url, largeur, hauteur){
      gauche = (screen.width/2)-(largeur/2);
      haut = (screen.height/2)-(hauteur/2);
      window.open(url,"popup","height="+hauteur+",width="+largeur+",status = no,toolbar = no,menubar = no,location = no,resizable = no,titlebar = no,scrollbars = no,fullscreen = no,top ="+haut+",left ="+gauche);
   } 
//-->

  /////////////////////////////////////////
 <!--//
 
var Netscape = (document.layers)? true:false;
var ieSIM = (document.all)? true:false;
var FFSIM = (document.getElementById)? true:false; 
var XSIM=0;
var YSIM=0;
var ob;

function MD(e) {
if (ieSIM) {
  if(event.srcElement.nodeName=='IMG' && event.srcElement.id=='imgsim'){
	 ob = document.getElementById('divficheacc').style;
	 var w_s=win_size();
     XSIM=event.offsetX+20;
     YSIM=event.offsetY +20 ; 
     } 
   }
else {
  if(e.target.nodeName=='IMG' && e.target.id=='imgsim'){
	     ob = document.getElementById('divficheacc').style;
       XSIM=e.layerX;
       YSIM=e.layerY;
     }
   }
   return false;
}

function MM(e) {
if (ob && ieSIM) {
	var w_s=win_size();
   ob.pixelLeft = event.clientX + document.documentElement.scrollLeft - XSIM;
   ob.pixelTop  = event.clientY + document.documentElement.scrollTop  - YSIM ;  
   return false; 
   }
   
if (ob && FFSIM && !ieSIM) {
   var tmpx = (e.clientX + window.pageXOffset - XSIM);
   var tmpy  = (e.clientY + window.pageYOffset  - YSIM);
	   ob.left = parseInt(tmpx)+'px';
	   ob.top = parseInt(tmpy)+'px';
   return false; 
   }
}

function MU() {
  if(ob){
    ob.zIndex=112;
    ob = null;
  }
return false;
}



if (document.addEventListener != null)
{ // e.g. Firefox, Opera, Safari
document.addEventListener("mousemove", MM, true);
document.addEventListener("mouseup", MU, true);
document.addEventListener("mousedown", MD, true);
}
else
{ // e.g. Internet Explorer (also would work on Opera)
document.attachEvent("onmousemove", MM);
document.attachEvent("onmouseup", MU);
document.attachEvent("onmousedown", MD);
} 
//-->