add this line in your blockcurrencies.php file
public function hookdisplayFooter($params){
if ($this->_prepareHook($params))
return $this->display(__FILE__, 'blockcurrenciesfooter.tpl');
}
add a blockcurrenciesfooter.tpl in your module folder.
add this code in blockcurrenciesfooter.tpl
<form id="setCurrency" action="{$request_uri}" method="post">
<div class="change_currency"><span>Choose Currency</span><br/>
<select class="change_currency">
{foreach from=$currencies key=k item=f_currency}
<option value="{$f_currency.id_currency}">
{$f_currency.sign} {$f_currency.name}
</option>
{/foreach}
</select>
</div>
</form>
<script type="text/javascript">
$('.change_currency').change(function(){
javascript:setCurrency($(this).val());
});
</script>
Hook "Currency block" module to displayFooter