function afficherMessage(div_id)
{
	document.getElementById(div_id).style.display = 'block';
	
}

function changerMessage(div_id, div_msg)
{
	document.getElementById(div_id).innerHTML = msg_fenetre;
}

function cacherMessage(div_id)
{
	document.getElementById(div_id).style.display = 'none';
}

function affichageFormulaire(div_id)
{
	if (document.getElementById(div_id).style.display == 'none')
		document.getElementById(div_id).style.display = 'block';
	else
		document.getElementById(div_id).style.display = 'none';
}

function detectResolution() 
{ 
	if(screen.width<1024) 
	{
		window.location = window.location+'?res=800';
	} 
}

function openPopup(url,w,h,scrolable, resizable)
{
	width = w;
	height = h;
	PosX = (screen.width - width) / 2;
	PosY = (screen.height - height) / 2;
	
	popup = window.open(url, '', "width=" + width + ",height="+height+",location=no,menubar=no,personalbar=no,resizable=" + resizable + ", top="+PosY+",left="+PosX+",screenX=" + PosX +",screenY=" + PosY + ",locationbar=no,scrollbars=" + scrolable + ",directories=no,statusbar=no,toolbar=no");  
	if (window.focus) {popup.focus()}
}

function centerWindows(url, largeur, hauteur)
{
	  width = largeur;
	  height = hauteur;
	  PosX = (screen.width - width) / 2;
	  PosY = (screen.height - height) / 2;
	  
	  window.open(url, 'p', "width=" + width + ",height="+height+",location=no,menubar=no,personalbar=no,resizable=yes, top="+PosY+",left="+PosX+",screenX=" + PosX +",screenY=" + PosY + ",locationbar=no,scrollbars=yes,directories=no,statusbar=no,toolbar=no");  
}

<!-- Code Rollover Dreamweaver -->

function MM_preloadImages() { //v3.0
  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() { //v3.0
  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) { //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_swapImage() { //v3.0
  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];}
}
<!-- Fin du code Rollover Dreamweaver -->