function creerPopup (nom, tailleX, tailleY, titre, url, parametres){
    

 
    var element = $(nom);
    
    if(element){
    
        Element.remove(nom);   
    
    }
    
    var Ytop = window.innerHeight/2-tailleY/2;
    var Xleft = window.innerWidth/2-tailleX/2;
    
    var XleftO = window.innerWidth;
	
    positionHaut = Ytop+"px";
    positionBas = Xleft+"px";
   
   
   
   
    heightCentre = tailleY-38;
	
	
    
    var aInserer = "";
    aInserer +=  "<div class='ombre' style='height:"+XleftO+"px;' id='ombre'>";
    aInserer +=  "<div class='popup' style='width:"+tailleX+"px;height:"+tailleY+"px;top:"+positionHaut+";left:"+positionBas+";' id='"+nom+"'>";
    aInserer +=  "<div class='popupEntete' id='"+nom+"Entete' onMouseDown=\"new Draggable('"+nom+"');\"><a class='boutonFermer' href='javascript:void(0)' onClick='Element.remove(\"ombre\");'></a>"+titre+"</div>";
    aInserer +=  "<div class='popupCentre' id='"+nom+"Centre' style='height:"+heightCentre+"px'></div>";
    aInserer +=  "</div>";        
    aInserer +=  "</div>";
 
    new Insertion.Top('popup', aInserer);
    
	var myAjax = new Ajax.Updater(
		nom+'Centre',
		url,
		{
		method: 'post',
		parameters: parametres,
		onCreate: function(){
					$(nom+"Centre").innerHTML = "<span style='font-size:18px;'>Chargement...</span>";
				},
		onFailure: rapporteErreur
		}
	);
	

}