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String.prototype.turkishToUpper = function () {
    var string = this;
    var letters = { "i": "İ", "ş": "Ş", "ğ": "Ğ", "ü": "Ü", "ö": "Ö", "ç": "Ç", "ı": "I" };
    string = string.replace(/(([iışğüçö]))/g, function (letter) { return letters[letter]; })
    return string.toUpperCase();
}
String.prototype.turkishToLower = function () {
    var string = this;
    var letters = { "İ": "i", "I": "ı", "Ş": "ş", "Ğ": "ğ", "Ü": "ü", "Ö": "ö", "Ç": "ç" };
    string = string.replace(/(([İIŞĞÜÇÖ]))/g, function (letter) { return letters[letter]; })
    return string.toLowerCase();
}