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<html >
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
</head>
<body>
<script type="text/javascript">
function test(){
alert('hello world');
}
</script>
<select id="test" onchange="test()">
<option value="value1">value 1</option>
<option value="value2">value 2</option>
<option value="value3">value 3</option>
</select>
<button id="test2" onclick="test()">test script</button>
</body>
</html>