Multiple tables and FixedColumns (or any plugin, from what the forums show) does not work

I am trying to get FixedColumns to work with multiple tables. Here is a complete working example, as simple as I can possibly make it. As you can see, the top table correctly locks the column, but the second table does not. The tables are created dynamically.

Any ideas? :(

<script src="DataTables/media/js/jquery.js"></script>
<script src="DataTables/media/js/jquery.dataTables.js"></script>
<script src="DataTables/media/js/FixedColumns.js"></script>




<table cellpadding=1 border=1 class='multidatatable'><form>
<thead><tr><th><input/></th><th><input/></th><th><input/></th></tr></thead>
<tbody><tr><td><input/></td><td><input/></td><td><input/></td></tr></tbody>
</form></table>

<table cellpadding=1 border=1 class='multidatatable'><form>
<thead><tr><th><input/></th><th><input/></th><th><input/></th></tr></thead>
<tbody><tr><td><input/></td><td><input/></td><td><input/></td></tr></tbody>
</form></table>

<script type="text/javascript">
	$(document).ready(function() {  
					
		var oTable = $('.multidatatable').dataTable( {
			"sScrollX": "100%",
			"sScrollXInner": "150%",
			
		} );
		new FixedColumns( oTable, {
			"iLeftColumns": 1
		} );
	} );
	
</script>