Plugin development help required

Hi have submitted a plugin to WP and have got an email asking me to change a few things first.

So the first they ask is that i change the code :

register_widget_control()

And

register_sidebar_widget()

As they have been depriciated. Now do i understand correctly from the codex that i just replace them with :

wp_register_sidebar_widget()

And

wp_register_widget_control()

Also they ask :
Please place your $currency array into a function rather than leaving it as a global variable as you have it now.

Can someone give me an example please ? Here is the original code :

$currency = array( 	'USD' => array( 'type' => __('U.S. Dollar', 'dextra'), 			'symbol' => '$'	),
					'AUD' => array( 'type' => __('Australian Dollar', 'dextra'), 	'symbol' => '$'	),
					'CAD' => array( 'type' => __('Canadian Dollar', 'dextra'), 		'symbol' => '$'	),
					'CHF' => array( 'type' => __('Swiss Franc', 'dextra'), 			'symbol' => ''	) ,
					'CZK' => array( 'type' => __('Czech Koruna', 'dextra'), 			'symbol' => ''	),
					'DKK' => array( 'type' => __('Danish Krone', 'dextra'), 			'symbol' => ''	),
					'EUR' => array( 'type' => __('Euro', 'dextra'), 					'symbol' => '€'	),
					'GBP' => array( 'type' => __('Pound Sterling','dextra'), 		'symbol' => '￡'	),
					'HKD' => array( 'type' => __('Hong Kong Dollar', 'dextra'), 		'symbol' => '$'	),
					'HUF' => array( 'type' => __('Hungarian Forint', 'dextra'), 		'symbol' => ''	),
					'ILS' => array( 'type' => __('Israeli New Shekel', 'dextra'), 	'symbol' => ''	),
					'JPY' => array( 'type' => __('Japanese Yen', 'dextra'), 			'symbol' => '￥'	),
					'MXN' => array( 'type' => __('Mexican Peso', 'dextra'), 			'symbol' => '$' ),
					'NOK' => array( 'type' => __('Norwegian Krone', 'dextra'), 		'symbol' => ''	),
					'NZD' => array( 'type' => __('New Zealand Dollar', 'dextra'), 	'symbol' => '$'	),
					'PLN' => array( 'type' => __('Polish Zloty', 'dextra'), 			'symbol' => ''	),
					'SEK' => array( 'type' => __('Swedish Krona', 'dextra'), 		'symbol' => ''	),
					'SGD' => array( 'type' => __('Singapore Dollar', 'dextra'), 		'symbol' => '$'	)
				);

Thanx for any help received

Justine