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passwordObject.size=number_of_chars

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<html>
<head>
<script type="text/javascript">
function changeSize()
  {
  document.getElementById("password1").size=40
  }
</script>
</head>
<body>

<form>
<input type="password" id="password1" />
<input type="button" id="button1" onclick="changeSize()"
value="Change size of the password field" />
</form>

</body>
</html>
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