ian escasa

Hi, I just want to seek help resolving my javascript, 

First, I already have a dynamic textboxes where i able to enable and disable with a checkbox.

I need to have atleast 100 textfields

wherein my javascript, I need to declare this variables below.  which are already like ten(10) but i need a 100.

My question is, how can I make this easy and short?

<script type="text/javascript">

            function letter_changed(letterCheckBox){

                if(letterCheckBox.checked){

                document.getElementById("requestChemicalName").disabled = false;
                document.getElementById("requestChemicalName2").disabled = false;
                document.getElementById("requestChemicalName3").disabled = false;
                document.getElementById("requestChemicalName4").disabled = false;
                document.getElementById("requestChemicalName5").disabled = false;
                document.getElementById("requestChemicalName6").disabled = false;
                document.getElementById("requestChemicalName7").disabled = false;
                document.getElementById("requestChemicalName8").disabled = false;
                document.getElementById("requestChemicalName9").disabled = false;
                document.getElementById("requestChemicalName10").disabled = false;

                } else {
                document.getElementById("requestChemicalName").disabled = true;
                document.getElementById("requestChemicalName2").disabled = true;
                document.getElementById("requestChemicalName3").disabled = true;
                document.getElementById("requestChemicalName4").disabled = true;
                document.getElementById("requestChemicalName5").disabled = true;
                document.getElementById("requestChemicalName6").disabled = true;
                document.getElementById("requestChemicalName7").disabled = true;
                document.getElementById("requestChemicalName8").disabled = true;
                document.getElementById("requestChemicalName9").disabled = true;
                document.getElementById("requestChemicalName10").disabled = true;
                }
            }

</script>

Thanks in advance!