<html>
<head>
<script type="text/javascript" src="script.js"></script>
</head>
<body>
<label for="qty">Quantity</label>
<input id="qty" value="0" />
<button onclick="modify_qty(-1)">-1</button>
<button onclick="modify_qty(+1)">+1</button>
</body>
</html>
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