Java Dropdown And XML

I have a drop down field that is dynamically populated using an XML sheet that looks like:

Code:

I populate the dropdown box using javascript that looks like this:

Code:

My the drop down form looks like this:

Code:

When a user clicks on the drop down box, all of the values inside "<title>" tags get displayed. Once the user has made their selection, the form is submitted and posts the user's option. My problem is that when the user clicks on the drop down box, I want them to see the content included in the "<title>" text but I want the form to post the data included in the "<xml>" tags.

For example, if the user clicks on the drop down menu and selects the option 'Animals' I want the form to post 'xml/animals.xml'. Any ideas how to handle this?