I have some custom drop-down menu's on a Wordpress powered site. When a user is adding a new post they will add 3 details to the post using the drop down menu's. For example one select box might look like this:
After the user chooses from the drop-down I want it to automatically add the value to the blog posts 'tags'. I can't modify the code that outputs the select box's else I might add <select id="car-make" onchange="update_tags();"> so it would need to be a function inside the <head> tag that listens to the specific <select> ID's and then changes the value of the <input> ID when the event happens.