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Dynamically adding content in Dropdown in Javascript

<html>
<head>
<script type="text/javascript">
function addOption(dropdown,text,value )
{
var optn = document.createElement("OPTION");
optn.text = text;
optn.value = value;
dropdown.options.add(optn);
}
</script>
</head>
<select id="year" name="year" style="width: 70px" ></select>
<script type="text/javascript">
var date = new Date();
var startYear = '2000' ;
var currentYear = date.getFullYear();
do
  {
   addOption(document.getElementById("year"), currentYear, currentYear);
   currentYear--;
  }
while (currentYear >= startYear);
</script>
</BODY>
</html>

*************Output*************

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