try this instead:
<tr>
<th class="WADADataTableHeader">Enroll Date:</th>
<td class="WADADataTableCell"><%=DoDateTime(String(WADAparticipant_data.Fields.Item("enroll_date").Value==null?"":(WADAparticipant_data.Fields.Item("enroll_date").Value)).replace(/"/g, '"'), 2, 1033)%></td>
</tr>
<tr>
<th class="WADADataTableHeader">Enroll Time:</th>
<td class="WADADataTableCell"><%=DoDateTime(String(WADAparticipant_data.Fields.Item("enroll_time").Value==null?"":(WADAparticipant_data.Fields.Item("enroll_time").Value)).replace(/"/g, '"'), 3, 1033)%></td>
</tr>