NUVOLETTA CHE APPARE/SCOMPARE(HTML)

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#nuvoletta {position:fixed;qui devi metterci o left o right: 0; bottom: 0; width: lunghezzadellabasefattaconilprogrammadigraficapx; background: url(codicedell'immagineeditata) no-repeat center; height: altezzaimmaginepx; -moz-opacity: 0.00; -khtml-opacity: 0.00; filter: alpha(opacity=00); opacity: 0.00; display: block !important; display:none}</style>
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