but_callback.addEventListener(MouseEvent.CLICK,actionButCallback); 


function actionButCallback(evt:MouseEvent){ 
 var paramObj:Object = LoaderInfo(this.root.loaderInfo).parameters;
 var url_site =  paramObj["url_site"];
 var action =  paramObj["action"];
 var url  = paramObj["url"];
 var banniere = paramObj["banniere"];
 debug.text = "url:" + url;
 var urlRequest=new URLRequest(url_site+"/spip.php?action="+action+"&banniere="+banniere+"&url="+url); 
 navigateToURL(urlRequest,"_self"); 
}