<form name="f">
<select name="slct">
<option value="1">No.1
<option value="2">No.2
<option value="3" selected>No.3
<option value="4">No.4
<option value="5">No.5
</select>
</form>
<script language="JavaScript">
<!--
for( i = 0; i < document.f.slct.options.length; i++ )
document.write( i + 1 , " : " , document.f.slct.options[i].defaultSelected , "<br>" );
//-->
</script>