function mostraDiv(id,bg){
if (document.getElementById(id).style.display=='none'){
document.getElementById(id).style.display='';
} else {
document.getElementById(id).style.display='none';
}
}
    function MM_showHideLayers() { //v9.0
      var i,p,v,obj,args=MM_showHideLayers.arguments;
      for (i=0; i<(args.length-2); i+=3) 
      with (document) if (getElementById && ((obj=getElementById(args[i]))!=null)) { v=args[i+2];
        if (obj.style) { obj=obj.style; v=(v=='show')?'visible':(v=='hide')?'hidden':v; }
        obj.visibility=v; }
    }