//ouvre une popup centerer par default
function open_popup(lien,fenetre,width,height,param){
    open_popup_with_cb(lien,fenetre,width,height,param,false)
}
/* POPUP */
function checked_closed(fen,callback){
	if (fen.closed){
			eval(callback);
	}
}
function open_popup_with_cb(lien,fenetre,width,height,param,callback){
	var left=(screen.availWidth-width)/2;
	var top=(screen.availHeight-height)/2;
	if (top <0) top=0;
	if (param!='') param=','+param;
	var fen=window.open(lien,fenetre,'top='+top+',left='+left+',width='+width+',height='+height+param);
	if(!fen.opener) fen.opener = self;
	if (callback!=undefined && callback!=false)
		window.setTimeout("checked_closed(fen,callback)",200);

}