function camada( sId ) {
       var sIframe = document.getElementById( sId );
       if( sIframe.style.visibility = "hidden" ) {
         sIframe.style.visibility = "visible";
       } else {
         sIframe.style.visibility = "hidden";
		 {
         sIframe.style.visibility == "visible";
       }
       }
     }

     function fechar( sId ) {
       var sIframe = document.getElementById( sId );
       if( sIframe.style.visibility == "hidden" ) {
         sIframe.style.visibility = "visible";
       } else {
         sIframe.style.visibility = "hidden";
		 {
         sIframe.style.visibility == "visible";
       }
       }
     }