Smarty：如何引用关联数组索引

Array $imagelist:

Array ( 
    [additional] => Array ( 
        [count] => 2 
        [image] => Array ( 
            [nokia_e61_1.jpg] => Array ( 
                [name_body] => nokia_e61_1 
                [name_ext] => jpg 
            ) 
            [nokia_e61_2.jpg] => Array ( 
                [name_body] => nokia_e61_2 
                [name_ext] => jpg 
            ) 
            [nokia_e61_3.jpg] => Array ( 
                [name_body] => nokia_e61_3 
                [name_ext] => jpg 
            ) 
            [nokia_e61_4.jpg] => Array ( 
                [name_body] => nokia_e61_4 
                [name_ext] => jpg 
            ) 
        ) 
    ) 
    [main] => nokia_e61 
) 
Array $imagelist:

Array ( 
    [additional] =>