How to allow only letter in simple javascript Function

This Function Is Used To Letters Only

function lettersOnly()
{
            var charCode = event.keyCode;
            if ((charCode > 64 && charCode < 91) || (charCode > 96 && charCode < 123) || charCode       ==        8 || charCode == 32)
                return true;
            else
                return false;
}

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