Marquee problems ie vs firefox

my marquee works just like I want it too in firefox, but starts in the wrong spot and pushes content down.  What am I missing? (veiw at www.gide.htsp.com)

Code:

<SCRIPT LANGUAGE="JavaScript">
var basespeed = 3000;
var speed = basespeed/20;
var scrollingRegion = 40;

var startPosition = 0;
var scrollFlag = true;
function SetSpeed (val) {
    speed = basespeed/val;
}
function showContent (){
    document.getElementById("nsfriendly").style.display = "";
}
</script>

<ilayer name = "nav" width = "204" height = "232" clip = "0,0,204,232">
<layer name = "navcontent" width = "204" height = "232"  visibility = "hidden">
    <div style="background-color: #FFFFFF; width : 204px;">
        <table width="0" border="0" cellspacing="0" cellpadding="0">
            <tr>
                <td><img src="http://216.150.213.182/servlet/ImageServer/anonymous_hotdesk_4/@gide/scroller_arrup.gif" style="cursor: pointer;" onclick="ChangeDirection('up')" width="61" height="24" border="0"></td>
                <td><img src="http://216.150.213.182/servlet/ImageServer/anonymous_hotdesk_4/@gide/scroller_arrdwn.gif" style="cursor: pointer;" onclick="ChangeDirection('down')" width="61" height="24" border="0"></td>
                <td><img src="http://216.150.213.182/servlet/ImageServer/anonymous_hotdesk_4/@gide/scroller_stop.gif" style="cursor: pointer;" onClick="StartStopMarq(0)"width="82" height="24" border="0"></td>
            </tr>
        </table>
    </div>

<script language="javascript">
function ChangeDirection(val) {
     var marTag = document.getElementById("ScrollTxt");
     ScrollTxt.start();
     if (marTag == null) { return; }
     marTag.direction = val;
}
function StartStopMarq(val) {
     var marTag = document.getElementById("ScrollTxt");
     if (marTag == null) { return; }
     if (val == 0) {
          marTag.stop();
     }
     else {
          marTag.start();
     }
}
</script>

<marquee  id="ScrollTxt" scrollamount="2" scrolldelay="10" direction="down" loop="true" width="204" height="390" onmouseover="this.stop();" onmouseout="this.start();">
<ilayer name = "nscontainer" width = "204" height = "232" clip = "0,0,204,232">
<layer name = "nscontent" width = "204" height = "232" visibility = "hidden">
    <SPAN id="nsfriendly" style="display:none">
<!—content here-->
  </span>
</layer>
</ilayer>

</marquee>
<script language="javascript">
    window.onload = showContent;
</script>