Uno fijo, donde se instala + otro, flotante, en el centro
<div style="text-align: right;"><a href="%20style="><img src="http://chez-swan.net/postit/gif-coreens/persos-divers/bulles_3.gif" alt="" /></a></div>
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<a href="http://ventaunpocodetodo.jimdo.com" style="center: 0px; position: fixed; top:100px;"><img src="http://chez-swan.net/postit/gif-coreens/persos-divers/bulles_6.gif" alt="" /></a></div>
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