var Url = {
    // public method for url encoding
    encode : function (string) {
        return escape(this._utf8_encode(string));
    },
    // public method for url decoding
    decode : function (string) {
        return this._utf8_decode(unescape(string));
    },
    // private method for UTF-8 encoding
    _utf8_encode : function (string) {
        string = string.replace(/\r\n/g,"\n");
        var utftext = "";
        for (var n = 0; n < string.length; n++) {
            var c = string.charCodeAt(n);
            if (c < 128) {
                utftext += String.fromCharCode(c);
            }
            else if((c > 127) && (c < 2048)) {
                utftext += String.fromCharCode((c >> 6) | 192);
                utftext += String.fromCharCode((c & 63) | 128);
            }
            else {
                utftext += String.fromCharCode((c >> 12) | 224);
                utftext += String.fromCharCode(((c >> 6) & 63) | 128);
                utftext += String.fromCharCode((c & 63) | 128);
            }
        }
        return utftext;
    },
    // private method for UTF-8 decoding
    _utf8_decode : function (utftext) {
        var string = "";
        var i = 0;
        var c = c1 = c2 = 0;
        while ( i < utftext.length ) {
            c = utftext.charCodeAt(i);
            if (c < 128) {
                string += String.fromCharCode(c);
                i++;
            }
            else if((c > 191) && (c < 224)) {
                c2 = utftext.charCodeAt(i+1);
                string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
                i += 2;
            }
            else {
                c2 = utftext.charCodeAt(i+1);
                c3 = utftext.charCodeAt(i+2);
                string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
                i += 3;
            }
        }
        return string;
    }
}

var addOpts = function(images, gallery, sel) {
		for (i = gallery.length-1; i>=0; i--){
			gallery.remove(i);
			}
		images.each(function(image) {
			gallery.options[gallery.length] = new Option(image.text,image.value);
			if(gallery.options[gallery.length-1].value == sel) gallery.options[gallery.length-1].selected = true;
			if(image.value == "" || image.value == "0") gallery.disabled = true;
			else gallery.disabled = false;
		});
		//var parent = gallery.getParent('div');
		//if (parent.getStyle('display') == 'none') parent.setStyle('display', 'block');
	};

function reqOpts(adres, dest, sel) {
	tdst = document.getElementById(dest);
	if(tdst) {
		tdst.disabled = true;
		tdst.options[0] = new Option ("proszę czekać...", "");
		var request = new Request.JSON({
			url: adres,
			onComplete: function(jsonObj) {
				addOpts(jsonObj.wartosci, tdst, sel);
				}
			}).send();
		}
	}