Mega Code Archive
Select options selectedIndex
<![CDATA[
The selectedIndex property returns the index number of the selected option in that instance of a select box.
<html>
<form name="myForm">
<select name="mySelect" onChange='alert(mySelect.options.selectedIndex)'>
<option value=A>AA</option>
<option value=B>BB</option>
<option value=C>CC</option>
<option value=D>DD</option>
</select>
</form>
</html>
]]>