function popupcentree(url,popupName,largeur,hauteur,options) { 
	var top=(screen.height-hauteur)/2; 
	var left=(screen.width-largeur)/2; 
	var opt = "top="+top+",left="+left+",width="+largeur+",height="+hauteur;
	if(options != ""){
		opt += options;
	}
	window.open(url,popupName,opt); 
}