/*
 *  SliderNav - A Simple Content Slider with a Navigation Bar
 *  Copyright 2010 Monjurul Dolon, http://mdolon.com/
 *  Released under the MIT, BSD, and GPL Licenses.
 *  More information: http://devgrow.com/slidernav
 */
$.fn.sliderNav = function(options) {
    var defaults = {
        items: ["a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"],
        debug: false,
        height: null,
        arrows: true
    };
    var opts = $.extend(defaults, options);
    var o = $.meta ? $.extend({}, opts, $$.data()) : opts;
    var slider = $(this);
    $(slider).addClass('slider');
    $('.slider-content li:first', slider).addClass('selected');
    $(slider).append('<div class="slider-nav"><ul></ul></div>');
    for(var i in o.items) $('.slider-nav ul', slider).append("<li><a alt='#"+o.items[i]+"'>"+o.items[i]+"</a></li>");
    var height = $('.slider-nav', slider).height();
    if(o.height) height = o.height;
    $('.slider-content, .slider-nav', slider).css('height',height);
    if(o.debug) $(slider).append('<div id="debug">Scroll Offset: <span>0</span></div>');
    $('.slider-nav a', slider).click(function(event){
//        $('.slider-nav a', slider).mouseover(function(event){
            var target = $(this).attr('alt');
            var cOffset = $('.slider-content', slider).offset().top;
            var tOffset = $('.slider-content '+target, slider).offset().top;
            var height = $('.slider-nav', slider).height();
            if(o.height) height = o.height;
            var pScroll = (tOffset - cOffset) - height/1000;
            $('.slider-content li', slider).removeClass('selected');
            $(target).addClass('selected');
            $('.slider-content', slider).stop().animate({
                scrollTop: '+=' + pScroll + 'px'
                }, 1500);
            if(o.debug) $('#debug span', slider).html(tOffset);
        });
    if(o.arrows){
        $('.slider-nav',slider).css('top','20px');
        $(slider).prepend('<div class="slide-up end"><span class="arrow up"></span></div>');
        $(slider).append('<div class="slide-down"><span class="arrow down"></span></div>');
        $('.slide-down',slider).click(function(){
            $('.slider-content',slider).animate({
                scrollTop : "+="+height+"px"
                }, 500);
        });
        $('.slide-up',slider).click(function(){
            $('.slider-content',slider).animate({
                scrollTop : "-="+height+"px"
                }, 500);
        });
    }
    };