<html>
<head>
<script type="text/javascript">
function insertOption()
{
var y=document.createElement('option');
y.text='Kiwi'
var x=document.getElementById("mySelect");
try
{
x.add(y,null); // standards compliant
}
catch(ex)
{
x.add(y); // IE only
}
}
</script>
</head>
<body>
<form>
<select id="mySelect">
<option>Apple</option>
<option>Pear</option>
<option>Banana</option>
<option>Orange</option>
</select>
<input type="button" onclick="insertOption()" value="Insert option" />
</form>
</body>
</html>