Update All Select Boxes On Page Using Javascript

I am trying to update all Select boxes on a page dynamically using
javascript, I simple want to change the selected item in each select
box when a tick box is pressed on the page. Each Select box is named
in the same convention ie. ddl_DeliveryStatus_ and then the recordID
and contains the same options in the same order. The number of select
boxes changes every time the page is loaded as this is all built using
ASP linked to a database.

I am hoping there is an array or collection or something similar I can
simply reference to do this, but an struggling to find the answer.