function dossier_show_all(id,img_id)
{
    if($(id).style.display == "none")
    {
        new Effect.BlindDown(id);  
        $(img_id).src = "/images/f_open.gif";
       
    }
    else
    {
        new Effect.BlindUp(id); 
        $(img_id).src = "/images/f_closed.gif";               
    }

    
}