Happy to help. This is useful.
Just an observation (and admittedly being a bit pedantic

), but I reckon the code could be simplified a little. Perhaps to something like the following:
var get_myList = document.getElementById("ORD");
var target_list = get_myList.getElementsByTagName("SELECT")[0];
var arr_items = target_list.getElementsByTagName("OPTION");
arr_items.title = "Choose status based on Order's status";
If the tags have definitely been defined, I'm not sure if there's much value in checking that the objects have been referenced i.e. the '
if (get_myList != null)...' and '
if (target_list != null)...' lines are probably not needed. Also, unless there is a typo, it doesn't look like the loop is doing anything.
Cheers