//create an jQuery plug in
(function($) {
    $.fn.pager = function(options) {
        var defaults = {
            Display: 3,
            PageCount: 0,
            currentPage: 0,
            outputNextPrevLinks: true,
            outputFirstAndLastLinks: true,
            ellipsisText: "...",
            prevText: "Prev",
            nextText: "Next",
            onClickFunction: "goToPage"
        };

        var options = $.extend(defaults, options);

        var links;
        var pager;

        if (options.PageCount <= 0) {
            $(this).empty();
            return;
        }

        if (options.currentPage >= options.PageCount) {
            options.currentPage = 0;
        }
        pager = '';
        options.Display = 3;

        if (options.PageCount <= 1)
            options.Display = -1;

        links = new Array();
        links.length = 0;
        links[0] = 0;

        if (options.Display == -1) {
            //links = new int[options.PageCount];
            for (i = 0; i < links.length; i++)
                links[i] = i + 1;
        }
        else {
            //links = new int[options.Display];
            links = new Array();
            links.length = options.Display;

            // current page in the middle of our range
            var middle = Math.floor(options.Display / 2.0) - 1;
            links[middle] = parseInt(options.currentPage);

            // pages preceding current page
            for (i = middle - 1; i >= 0; i--)
                links[i] = links[i + 1] - 1;

            // pages following current page
            for (i = middle + 1; i < links.length; i++)
                links[i] = links[i - 1] + 1;


            // Get rid of page numbers exceeding options.PageCount ("shift" page numbers to the right)
            while (links[links.length - 1] > options.PageCount) {
                for (i = 0; i < links.length; i++)
                    links[i]--;
            }

            // Get rid of 0 or negative pages ("shift" page numbers to the left)
            while (links[0] <= 0) {
                for (i = 0; i < links.length; i++)
                    links[i]++;
            }

            // assign -1 to pages over options.PageCount
            for (i = links.length - 1; i >= 0; i--) {
                if (links[i] > options.PageCount)
                    links[i] = -1;
                else
                    break;
            }
        }

        pager += "<ul id='pager'>";

        if (options.outputNextPrevLinks) {
            if ((options.currentPage + 1) > 1)
                pager += "<li id='" + (options.currentPage - 1) + "' class='pagePrev' onclick='" + options.onClickFunction + "(" + (options.currentPage - 1) + ")'>" + options.prevText + "</li>";
        }

        if (links[0] != 1) {
            if (options.outputFirstAndLastLinks) {
                if ((options.currentPage + 1) == 1) {
                    pager += "<li id='1'";
                    pager += "class='currentPage' onclick='" + options.onClickFunction + "(" + (0) + ")'>" + 1 + "</li>";
                }
                else {
                    pager += "<li id='1'";
                    pager += "class='page'onclick='" + options.onClickFunction + "(" + (0) + ")'>" + 1 + "</li>";
                }
            }

            if (links[0] != 2) {
                pager += options.ellipsisText;
            }
        }

        for (i = 0; i < links.length; i++) {
            if (links[i] == -1)
                break;

            pager += "<li id='" + links[i] + "'";

            if ((options.currentPage + 1) == links[i])
                pager += "class='currentPage'"
            else
                pager += "class='page'"

            pager += " onclick='" + options.onClickFunction + "(" + (links[i] - 1) + ")'>" + links[i] + "</li>"

            if (options.Display == -1)
                pager += " "; // write a space so page numbers can wrap if displaying ALL page links
        }

        if (links[links.length - 1] != -1 && links[links.length - 1] != options.PageCount) {
            if (links[links.Length - 1] != options.PageCount - 1) {
                pager += options.ellipsisText;
            }

            // output link to last page number
            if (options.outputFirstAndLastLinks)
                pager += "<li id='" + options.PageCount + "' class='page'";

            pager += " onclick='" + options.onClickFunction + "(" + (options.PageCount - 1) + ")'>" + options.PageCount + "</li>"
        }

        if (options.outputNextPrevLinks) {
            if ((options.currentPage + 1) < options.PageCount)
                pager += "<li id='" + (options.currentPage + 1) + "' class='pageNext' onclick='" + options.onClickFunction + "(" + (options.currentPage + 1) + ")'>" + options.nextText + "</li>"
        }

        pager + "</ul>";

        $(this).empty();
        $(pager).appendTo(this);

    };
}
)(jQuery);