If the property name includes a "-", put it between quotation marks:
<html>
<head>
<script type="text/javascript" src="js/jquery-1.3.2.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$("p").css({ "background-color":"yellow", "font-weight":"bolder" });
});
</script>
</head>
<body>
<body>
<p>asdf</p>
</body>
</html>
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