How does mysql_fetch_assoc store rows from a query?

I am using Dreamweaver's built in functionality to create a drop down list from a MySQL query.  The problem I have is that if I try to duplicate the list on the same page, only the first instance is filled with info from the query.  It may have something to do with the way "mysql_fetch_assoc" counts through the rows.  Can someone please explain how this works and how I can create multiple lists from the one query?  Thanks.

// The following is a couple snippets from my page:
 
mysql_select_db($database_gw2000Connect, $gw2000Connect);
$query_getAllNames = "SELECT * FROM users";
$getAllNames = mysql_query($query_getAllNames, $gw2000Connect) or die(mysql_error());
$row_getAllNames = mysql_fetch_assoc($getAllNames);
$totalRows_getAllNames = mysql_num_rows($getAllNames);
 
 
<select name="entryToApply">
  <?php do { ?>
  <option value="<?php echo $row_entriesToApply['invoiceNum']; ?>">
    <?php echo $row_entriesToApply['invoiceNum']; ?>
  </option>
  <?php } while ($row_entriesToApply = mysql_fetch_assoc($entriesToApply)); ?>
</select>

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