<input  type="text" name="adi" size="12" id="txtadi" onkeyup="Uppercase(this.id)"/>

	<script type="text/javascript">
		function Uppercase(x) {
			var str = document.getElementById(x).value;
//			str = str.replace( /i/gi , 'İ' );
			str = str.replace( /ş/gi , 'Ş' );
			str = str.replace( /ğ/gi , 'Ğ' );
			str = str.replace( /ü/gi , 'Ü' );
			str = str.replace( /ı/gi , 'I' );
			str = str.replace( /ç/gi , 'Ç' );
			str = str.replace( /ö/gi , 'Ö' );
			str = str.replace( /İ/gi , 'I' );

			

		document.getElementById(x).value = str.toUpperCase();
}
		</script>