I need to take data from a textarea on a website and decrypt it using a simple algorithm. The data is in the form of numbers separated by a comma. It also needs to read a space as a space. It looks like 42,54,57, ,57,40,57,44. Heres what I have so far:

var my_textarea = $('textarea[name = "words"]').first();
var my_value = $(my_textarea).val();
var my_array = my_value.split(",");

for (i=0; i < my_array.length; i++)
{
var nv = my_array - 124;
var acv = nv + 34;
var my_result = String.fromCharCode(acv);
}

prompt("", my_result);