/****
** hook_block_view()
****/
function currencycode_block_view($delta) {
$blocks = array();
//delta is your block name. then just set it equal to your return functions.
switch ($delta) {
case 'executive_sidebar':
$blocks['subject'] = '';
$blocks['content'] = drupal_get_form('currency_form');
break;
}
return $blocks;
}