I have a variable account_number in which account number is stored. now i want to get the value of the element having id as account_number. How to do it in javascript ?

I tried doing document.getElementById(account_number).value, but it is null.

html looks like this :

<input class='transparent' disabled type='text' name='113114234567_name' id='113114234567_name' value = 'Neeloy' style='border:0px;height:25px;font-size:16px;line-height:25px;' />

and the js is :

function getElement()

{   

 var acc_list = document.forms.editBeneficiary.elements.bene_account_number_edit;



    for(var i=0;i<acc_list.length;i++)

        {

            if(acc_list[i].checked == true)

                {



                    var account_number = acc_list[i].value.toString();

                    var ben_name = account_number + _name;



                    alert(document.getElementById(' + ben_name.toString() + ').value);

                }

         }

}

here bene_account_number_edit are the radio buttons.

Thanks