[jQuery] find and replace text in a variable

[Marcelo Wolfgang]

Hi all,

I've a form with a numeric drop down ( from 1 to 10 ) and when the
user select a number from it, I want to add the corresponding number
of textfields in my code, but I need to change the input name and I
can't figure out how to do that this is what I have right now

$("#add_opcoes").change(function (){
        var materias_num = this.value;
        var loop = $("#fd_opcoes").html()
        $("#fd_opcoes").empty()
        for(var i = 1; i <= materias_num; i++){
                $("#fd_opcoes").append(loop);
        }
});

and this is what is inside loop

<div id="add_formOpcao_1" class="overflow">
        <label for="add_opcao_1">Material 1:</label>
        <input name="add_opcao_1" type="text" size="50" />
</div>

what I want is to change all the 1 that are inside the variable with i
from the looping ( so it will be 1, 2 ...10 )

is there a way to do that easily or should I look at other options ?

TIA
Marcelo Wolfgang