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<head>
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window.onload = function(e) {
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var title = cookie ? cookie : getPreferredStyleSheet();
setActiveStyleSheet(title);
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<LINK title=uno media=all href="estilo1.css" type=text/css rel=stylesheet>
<LINK title=dos media=all href="estilo2.css" type=text/css rel="alternate stylesheet">
</head>
<body>
<a class=estilo onclick="setActiveStyleSheet('uno'); return false;" href="http://www.cosaextrañadedominio.com/#">estilo 1</A>
<a class=estilo onclick="setActiveStyleSheet('dos'); return false;" href="http://www.cosaextrañadedominio.com/#">estilo 2</A>
</body>
</html>
Espero te sirva, saludos