I did think that's what I was supposed to do from your initial suggestion in this thread and had tried adding:
$WA_fieldValuesStr = "".((isset($_POST["agent_id"]))?implode(", ",$_POST["agent_id"]):"") ."";
at no avail.
Here is the source of the page which does seem to be showing the values set:
<body>
<div class="WADAInsertContainer">
<form action="test_table_Insert.php" method="post" name="WADAInsertForm" id="WADAInsertForm">
<div class="WADAHeader">Insert Record</div>
<div class="WADAHorizLine"><img src="WA_DataAssist/images/_tx_.gif" alt="" height="1" width="1" border="0" /></div>
<table class="WADADataTable" cellpadding="0" cellspacing="0" border="0">
<tr>
<th class="WADADataTableHeader">ID:</th>
<td class="WADADataTableCell"></td>
</tr>
<tr>
<th class="WADADataTableHeader">agent_id:</th>
<td class="WADADataTableCell">
<!-- <input type="checkbox" name="agent_id" id="agent_id" value="1" /> -->
<input type="checkbox" name="agent_id[]" value="1" />John Brandenburg<br /><input type="checkbox" name="agent_id[]" value="2" />Christine Marshall<br /><input type="checkbox" name="agent_id[]" value="3" />John Brandenburg<br /><input type="checkbox" name="agent_id[]" value="4" />christine Marshall<br /></td>
</tr>
</table>
<div class="WADAHorizLine"><img src="WA_DataAssist/images/_tx_.gif" alt="" height="1" width="1" border="0" /></div>
<div class="WADAButtonRow">
<table class="WADADataNavButtons" border="0" cellpadding="0" cellspacing="0">
<tr>
<td class="WADADataNavButtonCell" nowrap="nowrap"><input type="image" name="Insert" id="Insert" value="Insert" alt="Insert" src="WA_DataAssist/images/Pacifica/Refined_insert.gif" /></td>
<td class="WADADataNavButtonCell" nowrap="nowrap"><a href="test_table_Results.php" title="Cancel"><img border="0" name="Cancel" id="Cancel" alt="Cancel" src="WA_DataAssist/images/Pacifica/Refined_cancel.gif" /></a></td>
</tr>
</table>
<input name="WADAInsertRecordID" type="hidden" id="WADAInsertRecordID" value="" />
</div>
</form>
</div>
</body>
It feels so close! I really appreciate your response so quickly to my post.