function Trdegistir(thisFieldName) {
	var thisField = thisFieldName.value;
	var oldStr = "abcçdefgðhýijklmnoöprsþtuüvyzÝÖÇÞÝÐÜ/:.-,;\\";
	var newStr = "abccdefgghiijklmnooprsstuuvyzIOCSIGU        ";
	var ch;
	var tmp2;
	var tmp1;
	for (var i = 0; i< thisField.length; i++) {
		ch = thisField.charAt(i);
		for(var ii = 0; ii < oldStr.length; ii++) {
			if(ch == oldStr.charAt(ii)) {
				tmp1 = thisField.substring(0,i);
				tmp2 = thisField.substring(i+1,thisField.length);
				thisField = tmp1 + newStr.charAt(ii) + tmp2;
			}			
		}

	}
	
	 thisFieldName.focus();
	 thisFieldName.value = thisField;
}