<html>
<head>
<script type='text/javascript' src='http://ajax.googleapis.com/ajax/libs/mootools/1.2/mootools-yui-compressed.js'></script>
</head>
<body>
<table class='table_for_product_details'>
<tr>
even
</tr>
<tr>
odd
</tr>
<tr>
even
</tr>
<tr width='30' height='30'>
odd
</tr>
<tr>
even
</tr>
<tr>
odd
</tr>
<tr>
even
</tr>
</table>
<script type='text/javascript'>
window.addEvent("domready", function () {
$$(".table_for_product_details tr:odd").setStyle("color", "red");
});
</script>
</body>
</html>
Аналогичный код с color:red.