ExcelBanter - Spreadsheet web component

I tried using the clsid 0002E510-0000-0000-C000-000000000046 in a test html
doc:

<html
<body
<object classid="clsid:0002E510-0000-0000-C000-000000000046"
id="Spreadsheet1"
</object
<input type=button value="button" name=button1
<script language=javascript for="button1" event="onclick"
var z = new Array(3);
z[0]="aaa";
z[1]="bbb";
z[2]="ccc";
Spreadsheet1.Range("a1:c1").Value=z;
</script
</body
</html

This works on a machine with Office 2000, but not on one with Office 2003.
On the latter, I get this error:

Error: Object doesn't support this property or method

Any ideas?