String.prototype.toHankakuCase = function() {
    var index;
    var focus;
    var ret = [];
    var map = {
        0x30A1:0xFF67, 0x30A3:0xFF68, 0x30A5:0xFF69, 0x30A7:0xFF6A, 0x30A9:0xFF6B,
        0x30FC:0xFF70, 0x30A2:0xFF71, 0x30A4:0xFF72, 0x30A6:0xFF73, 0x30A8:0xFF74,
        0x30AA:0xFF75, 0x30AB:0xFF76, 0x30AD:0xFF77, 0x30AF:0xFF78, 0x30B1:0xFF79,
        0x30B3:0xFF7A, 0x30B5:0xFF7B, 0x30B7:0xFF7C, 0x30B9:0xFF7D, 0x30BB:0xFF7E,
        0x30BD:0xFF7F, 0x30BF:0xFF80, 0x30C1:0xFF81, 0x30C4:0xFF82, 0x30C6:0xFF83,
        0x30C8:0xFF84, 0x30CA:0xFF85, 0x30CB:0xFF86, 0x30CC:0xFF87, 0x30CD:0xFF88,
        0x30CE:0xFF89, 0x30CF:0xFF8A, 0x30D2:0xFF8B, 0x30D5:0xFF8C, 0x30D8:0xFF8D,
        0x30DB:0xFF8E, 0x30DE:0xFF8F, 0x30DF:0xFF90, 0x30E0:0xFF91, 0x30E1:0xFF92,
        0x30E2:0xFF93, 0x30E4:0xFF94, 0x30E6:0xFF95, 0x30E8:0xFF95, 0x30E9:0xFF97,
        0x30EA:0xFF98, 0x30EB:0xFF99, 0x30EC:0xFF9A, 0x30ED:0xFF9B, 0x30EF:0xFF9C,
        0x30F2:0xFF66, 0x30F3:0xFF9D, 0x3000:0x0020
    };

    for (index=0,focus=this.length; index<focus; index++) {
        var c = this.charCodeAt(index);
        switch(true) {
            case (c in map):
                ret.push(map[c]);
                break;
            case (0xFF10 <= c && c <= 0xFF19) || (0xFF21 <= c && c <= 0xFF5E) || (0xff40 <= c && c <= 0xff5a):
                ret.push(c - 0xFEE0);
                break;
            case (0x30AB <= c && c <= 0x30C9):
                ret.push(map[c-1], 0xFF9E);
                break;
            case (0x30CF <= c && c <= 0x30DD):
                ret.push(map[c-c%3], [0xFF9E,0xFF9F][c%3-1]);
                break;
            default:
                ret.push(c);
                break;
        };
    };
    return String.fromCharCode.apply(null, ret);
};

var StringUtil = Class.create();
StringUtil.prototype = {
	initialize : function(){
	},
	countChar : function(value, pattern, pos) {
		var i = 0;
		var j = 0;
		var ret = 0;
		for (i=0; i<value.length; i++) {
			if (pos == -1 || i == pos) break;
			for (j=0; j<pattern.length; j++) {
				if (value.charCodeAt(i) == pattern[j]){
					ret++;
				}
			}
		}
		return ret;
	}
};
StringUtil = new StringUtil();