[jQuery] ui.mouse is null or not an object

[jQuery] ui.mouse is null or not an object


Hi,
I am adding the following library and still getting the "ui.mouse is
null or not an object" JavaScript error:
Here are my references:
<script src="Scripts/jquery-1.2.6.js" type="text/javascript"></
script>
<script src="Scripts/ui.sortable.js" type="text/javascript"></
script>
<script src="Scripts/ui.core.js" type="text/javascript"></script>
Thanks,
Azam