JavaScript/jQuery optimization

I have just finished my new portfolio site visible at http://www.pepkarsten.com/artdirection.

It is a single page that loads images (with loader animation, preloading and keyboard shortcuts).

Here is the JavaScript code (using jQuery). How can it be optimized?

$(document).ready(function() {
    function page(slide,width,height,color) {
        this.slide=slide;
        this.width=width;
        this.height=height;
        this.color=color;
    };

    var pages=[
        new page('alutech1',900,675,'1d486b'),
        new page('alutech2',900,675,'00ea00'),
        new page('mane3',675,900,'74878e'),
        new page('mane4',675,900,'74878e'),
        new page('mane1',900,675,'6ecb00'),
        new page('topfit_zen',900,675,'203400'),
        new page('topfit_muscu',900,675,'01acb3'),
        new page('topfit_stval',900,675,'525962'),
        new page('arles_1',636,900,'fb926d'),
        new page('arles_2',636,900,'c12f2f'),
        new page('arles_3',636,900,'cdc6b4'),
        new page('topsol',900,633,'f7e700'),
        new page('wak',900,675,'78f900')
    ];
    var imgDir='img/';
    var slidePrefix='pepkarsten_';
    var slideExt='.jpg';
    $.autoMouseOver();
    $.blurLinks();

    function prevPageNumber() {
        return currentPage>0?currentPage-1:pages.length-1;
    };

    function nextPageNumber() {
        return currentPage<pages.length-1?currentPage+1:0;
    };

    function displayPage(n) {
        $('#nav-top')
            .css('background-color','#'+pages[n].color);
        $('#slide')
            .addClass('loading')
            .find('img')
            .css('visibility','hidden')
            .css('width',pages[n].width)
            .css('height',pages[n].height)
            .unbind('load')
            .load(function() {
                $(this)
                    .css('visibility','visible');
                $('#slide')
                    .removeClass('loading');
                $.preloadImg(imgDir+slidePrefix+pages[nextPageNumber()].slide+slideExt,imgDir+slidePrefix+pages[prevPageNumber()].slide+slideExt);
            })
            .attr('src',imgDir+slidePrefix+pages[n].slide+slideExt);
        currentPage=n;
    };

    function homePage() {
        displayPage(0);
    };

    function nextPage() {
        displayPage(nextPageNumber());
    };

    function prevPage() {
        displayPage(prevPageNumber());
    };

    homePage();
    $('#home')
        .onclick(homePage)
        .shortcut('up');
    $('#next')
        .onclick(nextPage)
        .shortcut('right');
    $('#prev')
        .onclick(prevPage)
        .shortcut('left');
    $('#slide')
        .onclick(nextPage);
    $('#contact')
        .email('info','pepkarsten.com')
        .hover(
            function() {$('#tip-contact').slideDown(200)},
            function() {$('#tip-contact').stop(true,true).hide()});
    $('#linkedin')
        .onclick(function() {
            window.open('http://www.linkedin.com/in/pepkarsten');
        })
        .hover(
            function() {$('#tip-linkedin').slideDown(200)},
            function() {$('#tip-linkedin').stop(true,true).hide()});
});

(function($){
    var imgCache=new Array();
    $.preloadImg=function() {
        for(var i=0; i<arguments.length; i++) {
            var img=new Image();
            img.src=arguments[i];
            imgCache[img.src]=img;
        }
    };
    $.autoMouseOver=function(outStr,overStr) {
        if(!overStr) var outStr='-out.', overStr='-over.';
        $('img[src*='+ outStr +']')
            .each(function() {$.preloadImg($(this).attr("src").replace(outStr,overStr))})
            .hover(
                function() {$(this).attr("src",$(this).attr("src").replace(outStr,overStr))},
                function() {$(this).attr("src",$(this).attr("src").replace(overStr,outStr))});
    };
    $.blurLinks=function() {
        $("a").focusin(function() {
            this.blur();
        });
    };
    $.fn.onclick=function(f) {
        $(this).click(function() {
            f();
            return false;
        });
        return this;
    };
    $.address=function(u,d) {
        return u+'@'+d;
    };
    $.fn.email=function(u,d,s,b) {
            var l='mailto:'+$.address(u,d);
            if(s||b) {
                l+='?';
                if(s) {
                    l+='subject='+s;
                    if(b) l+='&';
                };
                if(b) l+='body='+b;
            };
        $(this).click(function() {
            window.open(l);
            return false;
        });
        return this;
    };
    $.fn.shortcut=function(key) {
        var code={'left':37,'up':38,'right':39,'down':40};
        var $this=$(this);
        $(document).keydown(function(e) {
            if(e.keyCode==code[key]) {
                $this.click();
                return false;
            };
        });
        window.focus();
        return this;
    };
})(jQuery);