Add currency indicator to textfield

I had a thought that it would be nice to have the currency indicator on the textfield for the donation amount. You can add the following to that element's array to do it like I've done in the cart settings form for the minimum order subtotal:

    '#field_prefix' => variable_get('uc_sign_after_amount', FALSE) ? '' : variable_get('uc_currency_sign', '$'),
    '#field_suffix' => variable_get('uc_sign_after_amount', FALSE) ? variable_get('uc_currency_sign', '$') : '',