I need to remove top item from right column.

Tried from link "http://www.mredkj.com/tutorials/tutorial005.html"

Question :

1 how to I refresh screen to show new set of values. ( Currently for me it shows old values.)
2 After sorting, values change. How do i remove current top value.




Code:
				<div class="selectTask">
					<form name="TaskList" method="post" action="TaskList.asp">
						<select name="searchable[]" id='searchable' multiple='multiple'>
							<?php foreach( $output as $each ): ?>
							<?php $var++?>
							<option value="$var"><?=$each?></option>
							<?php endforeach; ?>
						</select>
					</form>
				</div>