JQuery on array of inputs

[ditchy]

Hi! I need help over my codes:
This code is to make a text field appear when the checkbox is selected

PHP Code:

$(document).ready(function(){
        $("#ben").click(function(){
            $("#benamount").toggle("fast");
            $(this).toggleClass("active");
        document.adminForm.ben.checked = true;
        return false;
    });
    }); 


And this is the form part..

PHP Code:

<input type = 'Checkbox' id="ben" value ="net"></input>
<input style="display:none;" type='text' id="benamount"></input> 


But, I need to make the checkbox and the text field on loop. I need them on array. How will I do it? I need them to be dynamic, that's why I put them on array.
Please help. the script will only work on the first element but not on the succeeding elements. Thank you!!!!