<!doctype html>
<html>
<head>
<style type="text/css">
#block {width:100px; height:100px; border:1px solid #ccc;}
</style>
<script src="http://code.jquery.com/jquery-1.9.1.js"></script>
<script type="text/javascript">
function funonload() {
$("#block").css("background-color", "yellow");
}
</script>
<meta charset="utf-8">
<title>TEST</title>
</head>
<body>
<div id="block"></div>
</body>
</html>