IE does not support position:fixed, so we have to use trickery to give the illusion of a fixed table head. The problem with such tricks is that they are not solitary things...
<div id="screenlistdisplay">
<table width="98%">
<tr>
<td> ID </td>
<td> Sev </td>
<td> Owner </td>
<td> Summary </td>
</tr>
</table>
</div>
div#screenlistdisplay td {
screen header styles here
}