Request for assistance - Webfacing and special field types (radio/checkbox)

Folks:

I've got an issue that I've diligently searched and tried to solve on my
own; so much so that if I saw a solution now in my searching I'd probably
not be able to recognize it.  Such is the curse of too much pride to ask for
help.

My situation is this: I've got a 5250 screen with checkboxes enabled in it,
via the enhanced 5250 display characteristics.  The keywords for that
support are not supported in webfacing, and I was aware of that when I
created them, but had assumed I was wise enough to design around it.  Turns
out I was wrong.  I've not found a single example of the code required to
replace that function, and would appreciate it if one of you could point me
in the correct direction.

Generally speaking, what I'm doing now is:

Hiding the 2 digit control field required in DDS for the MLTCHCFLD keyword
Exposing the four DDS-hidden checkbox fields (1 -or- 0 value) to the
webfacing as hidden fields
Created a dummy 1 byte text field directly after the 2 digit field above,
and inserted HTML into it via CODE Designer that looks something like this:

 Limit to customer types: First <INPUT TYPE="checkbox" ID="seltype1">
 Second <INPUT TYPE="checkbox" ID="seltype2">
 Third <INPUT TYPE="checkbox" ID="seltype3">
 Fourth <INPUT TYPE="checkbox" ID="seltype4">
 <script>
 setCheckBoxValue("l1_BYCUST_yCTL$SELOPT$1",seltype1);
 setCheckBoxValue("l1_BYCUST_yCTL$SELOPT$1",seltype2);
 setCheckBoxValue("l1_BYCUST_yCTL$SELOPT$1",seltype3);
 setCheckBoxValue("l1_BYCUST_yCTL$SELOPT$1",seltype4);
 </script>

setCheckBoxValue is a function in one of the JS files in ClientScript/usr
and looks like this:

function setCheckBoxValue(id_name,cb_name)
{
get_cb = eval(cb_name);
get_id = eval(id_name);
if (get_id.value == '1')
        {
        get_cb.checked = true;
        }
else
        {
        get_cb.checked = false;
        }
}

Any hints or suggestions are greatly appreciated in advance.

MP