// キー入力管理 ///////////////
var keyTable = Object();
keyTable.is_alphabet = function(keyCode){
	return ( keyCode >= 65 && keyCode <= 90 );
}
keyTable.is_symbol = function(keyCode){
	var inputChar = String.fromCharCode(keyCode);
	var symbolTable = '"\\'+"!#$%&'()=~|^-{}[]*`@:+;<,>.?/_";
	return symbolTable.search(inputChar) != -1;
}