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$.fn.onlyLetters = function() {
        return this.each(function() {
            $(this).keypress(function(e) {
                var key = e.charCode || e.keyCode || 0;
                // allow backspace, tab, delete, arrows, letters, numbers and keypad numbers ONLY
                return (
                    /^[a-z]+$/i.test(e.target.value) || 
                    key == 209 || 
                    key == 241 || 
                    key == 32 || 
                    key == 8 || 
                    key == 9 ||
                    key == 46 ||
                    //(key >= 37 && key <= 40) ||
                    //(key >= 48 && key <= 57) ||
                    (key >= 65 && key <= 90) ||
                    (key >= 96 && key <= 122));
            })
        })
    };

    $('#txt_name').onlyLetters();