The defaultSelected property specifies the initial option selection of the select list.
<html>
<head>
<title> Example of the defaultSelected property of the option object</title>
</head>
<body>
<script language="JavaScript">
<!--
function check(myForm){
for (var i = 0; i < document.form1.myList.length; i++) {
if (document.form1.myList.options[i].defaultSelected == true) {
alert("The default value is: 2");
}
}
}
-->
</script>
<form name=form1>
<select name="myList" multiple>
<option value=1>One
<option value=2 SELECTED>Two
<option value=3>Three
<option value=4>Four
</select><P>
<input type="button" value="Get Default Value" onClick='check(this.form)'>
</form>
</body>
</html>