number to currency format in javascript

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Javascript

I want to convert number to indian currency format ...It works perfactly for 0-9(48-57 ascii value)..bt for 0-9(97-105) it creates problem ny code is

$('input.number').keyup(function(event) {

          // skip for arrow keys


      if (event.which >= 31 && event.which <= 48 || event.which > 57 && event.which <= 97 || event.which > 105) return;

          // format number

          $(this).val(function(index, value) {
              return value
                  .replace(/\D/g, '')
                  .replace(/(\d)(?=(\d\d)+\d$)/g, "$1,")
              ;
          });
      });

for 48 to 57 it gives output==1,111
bt for 97 to 105 it does attach comma at perfact place....i caaled this funnction onkeypress event of textbox..........and in 97 to 105 key it works after one backspace

....