IE - Ensure Required Fields Populated Before Screen Prints

I have a basic html form with some text input fields and a couple drop down selection lists. Our employees print the form and include it with items they need our shipping department to ship for them. The form uses the following verification script to ensure the required fields have been populated before the screen prints. It works exactly as desired in Safari and Firefox. In Internet Explorer, however, the selections made in the drop down lists are reset to the default values on the printed form.

Before you respond with, "don't use Internet Explorer," you have to understand that Internet Explorer is our only corporate approved web browser because it is the only browser supported by some of our other "mission critical" third party web apps and because it can be more rigorously controlled using Group Policies than Safari, Firefox, Chrome, Opera, et al, can. How to make the form print without resetting the drop down list selections? :confused:

<script language="javascript">
function verify() {
var themessage = "You must provide the following information";
if (document.shipment.SenderName.value == "") {
themessage = themessage + ", Sender Name";
} .....