Problem with draggable element <TR> in IE6

Problem with draggable element <TR> in IE6


Hi everybody,
I have a problem whith JQuery UI 1.5.2 and the draggable element <TR>
of a table.
it definetly crash my browser IE6 although in firework it work well.
I have problem only with the element <TR>, with the others like
<INPUT>, <TD> ... I do not have this problem.
Here is my code
*************************************************************************************************************
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<script src="http://code.jquery.com/jquery-latest.js"></script>
<script src="http://dev.jquery.com/view/tags/ui/latest/ui/
ui.core.js"></script>
<script src="http://dev.jquery.com/view/tags/ui/latest/ui/
ui.draggable.js"></script>
<script>
$(document).ready(function(){
$(".block").draggable({
    cursorAt: { top: 10, left: 17 },
        ghosting: true,
        opacity: 0.5,
        helper: function(e){
            return $("<div>coucou</div>");
        }
    });
});
</script>
<style>
.block {
border: 2px solid #0090DF;
background-color: #68BFEF;
width: 150px;
height: 70px;
margin: 10px;
}
</style>
</head>
<body>
<table>
    <tr class="block">
        <td>clolonne 1.1</td>
        <td>clolonne 1.2</td>
        <td>clolonne 1.2</td>
        <td>clolonne 1.2</td>
    </tr>
         <tr class="block">
        <td>clolonne 2.1</td>
        <td>clolonne 2.2</td>
        <td>clolonne 2.2</td>
        <td>clolonne 2.2</td>
    </tr>
</table>
</body>
</html>
*************************************************************************************************************
Thanks