IE10 is relating to choice1_select
as a variable
Replace the code to activate the move with
MoveElements(document.getElementById("choice1_select"),
document.getElementById("choice2_select"))
Change NAME
to ID
in the combobox definition
<SELECT ID="choice1_select" CLASS="Form150" size="7" MULTIPLE>
...
</SELECT>
<SELECT ID="choice2_select" CLASS="Form150" size="7" MULTIPLE>
...
</SELECT>
See also How do I pass an HTML element as an argument to a Javascript function?