JSTL formatting for displaytag column

[fea jabi]

Have an object Account which has couple of attributes in it.
using displaytag to show all the accounts.

<display:table name="accountscoll" requestURI="PrepareSummaryAction.do">
       <display:column property="accountNumber" />
       <display:column property="accountType">
       <display:column property="balance">
              <fmt:formatNumber value="${}" type="currency"/>
       </display:column>
...................
................
</display:table>

want to display the values in the column as $1000 or so. i.e prefix the 
value with dolar sign.

I am not sure what the value="${}" would be.

accountcoll has List of Account objects.

Thanks.

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