window.addEvent('domready', function () {
    function UserError(text) {
        this.text = text;
    }

    function pageNumberToUrl(n) {
        var pageNumbers = [
            9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
            20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30,
            31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41,
            42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52,
            53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
            64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74,
            75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85,
            86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96,
            97, 98, 99, 10, 11, 12, 13, 14, 15, 16, 17,
            18, 110, 112, 114, 116, 118, 120, 121, 122, 123, 124,
            125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135,
            136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146,
            147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157,
            158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168,
            169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179,
            180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190,
            191, 192, 193, 194, 195, 196, 197, 198, 199, 20, 22,
            23, 24, 25, 26, 27, 28, 29, 210, 211, 212, 213,
            214, 215, 216, 217, 218, 219, 220, 221, 222, 223, 224,
            225, 226, 227, 228, 229, 230, 231, 232, 233 
        ];

        if (!$type(n) === 'number') throw new UserError("not a number");
        if (!pageNumbers.contains(n)) throw new UserError("Page not found");
        return "/catalogue/" + pad(n, '0', 3) + ".aspx";
    } 

    function pad(str, padding, targetLength) {
        var s = str.toString(),
            l = ( targetLength - s.length ).max(0),
            prefix = repeatStr(padding, l);

        return prefix + s;

        function repeatStr(str, n) {
            for (var o = '', i=0; i<n; i++) o+=str;
            return o;
        }
    }

    var searchForm = $('pageSearch'),
        searchInput = $('pageNumber'),
        errorsDiv = searchForm.getElement('.errors');
    
    errorsDiv.fade('hide');
    searchForm.addEvent('submit', function (evt) {
        var event = new Event(evt),
            pageNumber = parseInt(searchInput.get('value'));

        event.preventDefault();

        try {
            window.location.href = pageNumberToUrl(pageNumber);
        } catch (err) {
            if (err instanceof UserError) {
                errorsDiv.set('text', err.text);   
                errorsDiv.fade('show');
            } else {
                throw err;
            }
        }
    });
});