(function($) {
    $.fn.pager = function(options) {
        var opts = $.extend({}, $.fn.pager.defaults, options);
        return this.each(function() {
        // empty out the destination element and then render out the pager with the supplied options
            $(this).empty().append(renderpager(parseInt(options.pagenumber), parseInt(options.pagecount), options.buttonClickCallback));
            // specify correct cursor activity
            $('.pages li').mouseover(function() { document.body.style.cursor = "pointer"; }).mouseout(function() { document.body.style.cursor = "auto"; });
        });
    };
    // render and return the pager with the supplied options
    function renderpager(pagenumber, pagecount, buttonClickCallback) {
        if (pagecount <= 1)
            return;
        // setup $pager to hold render
        var $pager = $('<ul class="pages"></ul>');
        // add in the previous and next buttons
        $pager.append(renderButton('<img src="base/images/all/pager1/first.gif" width="10" height="16" />', pagenumber, pagecount, buttonClickCallback)).append(renderButton('<img src="base/images/all/pager1/prev.gif" width="10" height="16" />', pagenumber, pagecount, buttonClickCallback));
        // pager currently only handles 10 viewable pages ( could be easily parameterized, maybe in next version ) so handle edge cases
        var startPoint = 1;
        var endPoint = 9;
        if (pagenumber > 4) {
            startPoint = pagenumber - 4;
            endPoint = pagenumber + 4;
        }
        if (endPoint > pagecount) {
            startPoint = pagecount - 8;
            endPoint = pagecount;
        }
        if (startPoint < 1) {
            startPoint = 1;
        }
        // loop thru visible pages and render buttons
        for (var page = startPoint; page <= endPoint; page++) {
            var currentButton = $('<li class="page-number">' + (page) + '</li>');
            page == pagenumber ? currentButton.attr('class','page-number-1') : currentButton.click(function() { buttonClickCallback(this.firstChild.data); });
            currentButton.appendTo($pager);
        }
        // render in the next and last buttons before returning the whole rendered control back.
        $pager.append(renderButton('<img src="base/images/all/pager1/next.gif" width="10" height="16" />', pagenumber, pagecount, buttonClickCallback)).append(renderButton('<img src="base/images/all/pager1/last.gif" width="10" height="16" />', pagenumber, pagecount, buttonClickCallback));
        return $pager;
    }
    // renders and returns a 'specialized' button, ie 'next', 'previous' etc. rather than a page number button
    function renderButton(buttonLabel, pagenumber, pagecount, buttonClickCallback) {
        var $Button = $('<li class="pgNext">' + buttonLabel + '</li>');
        var destPage = 1;
        // work out destination page for required button type
        switch (buttonLabel) {
            case '<img src="base/images/all/pager1/first.gif" width="10" height="16" />':
                destPage = 1;
                break;
            case '<img src="base/images/all/pager1/prev.gif" width="10" height="16" />':
                destPage = pagenumber - 1;
                break;
            case '<img src="base/images/all/pager1/next.gif" width="10" height="16" />':
                destPage = pagenumber + 1;
                break;
            case '<img src="base/images/all/pager1/last.gif" width="10" height="16" />':
                destPage = pagecount;
                break;
        }
        // disable and 'grey' out buttons if not needed.
        if (buttonLabel == '<img src="base/images/all/pager1/first.gif" width="10" height="16" />' || buttonLabel == '<img src="base/images/all/pager1/prev.gif" width="10" height="16" />') {
            pagenumber <= 1 ? 1==1 : $Button.click(function() { buttonClickCallback(destPage); });//$Button.addClass('pgEmpty')
        }
        else {
            pagenumber >= pagecount ? 1==1 : $Button.click(function() { buttonClickCallback(destPage); });//$Button.addClass('pgEmpty')
        }
        return $Button;
    }
    // pager defaults. hardly worth bothering with in this case but used as placeholder for expansion in the next version
    $.fn.pager.defaults = {
        pagenumber: 1,
        pagecount: 1
    };
})(jQuery);