Can I lock an <li> in place in a sortable list?

Can I lock an <li> in place in a sortable list?

Hi...
I've got a <ul> list where I add some <li>'s to be sortable... but i
want to add two <li>'s at the end and *not* allow the user to move
these around, yet have these <li>'s "look" like the rest to keep
things consistant
right now i have like
<ul class="C_Sortable">
<li class="ui-state-default">Sortable Item 1</li>
<li class="ui-state-default">Sortable Item 2</li>
<li class="ui-state-default">Sortable Item 3</li>
<li class="ui-state-default">Locked Item 1</li>
<li class="ui-state-default">Locked Item 2</li>
</ul>
Possible?
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