// copied and modified from http://andreaslagerkvist.com/jquery/center/

jQuery.fn.center = function(absolute) {
    return this.each(function() {
        var t = jQuery(this);

        t.css({
            position: absolute ? 'absolute' : 'fixed',
            left: '50%',
            top: '50%',
            zIndex: '99'
        }).css({
            marginLeft: '-' + (t.outerWidth() / 2) + 'px',
            marginTop: '-' + (t.outerHeight() / 2) + 'px'
        });

        if (absolute) {
            t.css({
                marginTop: parseInt(t.css('marginTop'), 10) + jQuery(window).scrollTop(),
                marginLeft: parseInt(t.css('marginLeft'), 10) + jQuery(window).scrollLeft()
            });
        }
    });
};


jQuery.fn.centerHoriz = function(absolute) {
    return this.each(function() {
        var t = jQuery(this);

        t.css({
            position: absolute ? 'absolute' : 'fixed',
            top: '50%',
            zIndex: '99'
        }).css({
            marginTop: '-' + ((t.outerHeight() + 60) / 2) + 'px'
        });

        if (absolute) {
            t.css({
                marginTop: parseInt(t.css('marginTop'), 10) + jQuery(window).scrollTop()
            });
        }
    });
};