// Version 1.0 (24.05.2011) BL
$(document).ready(function(){

    var showTime = 7000; // Anzeigedauer (in Millisekunden)
    var transitionTime = 1500; // Transitiondauer (Fade ein und aus) (in Millisekunden)
    if (navigator.appVersion.indexOf("MSIE 7") != -1) transitionTime = 0; // bei IE 7 keine Transition
    if (navigator.appVersion.indexOf("MSIE 8") != -1) transitionTime = 0; // bei IE 8 keine Transition
    var curSlide = 0;
    var noOfSlides = $('.slideshow-item').length;
    var aFadeEl = new Array('#slide', '#slideshow-mask-', '#slide-t1-', '#slide-t2-');
    var intervall;
    
    // Bilder vorausladen (preloader)
    var cache = [];
    $.preLoadImages = function() {
        var args_len = arguments.length;
        var aImages = arguments[0];
        for (var i = 0; i < aImages.length; i++) {
            var cacheImage = document.createElement('img');
            cacheImage.src = aImages[i]; // Arguments are image paths relative to the current page.
            cache.push(cacheImage);
        }
    }

    $.preLoadImages(aImg);

    // Nachdem die Bilder vorausgeladen wurden: erstes Bild einblenden
    //  $('#slide0').load(function() { alert('Image Loaded'); }); // doesn't work
    $(window).load(function(){
        $('.slideshow-loading').fadeOut(100);
        fadeIn();
        $('#slideshow-next').fadeIn(transitionTime);
        //$('#slideshow-pause').fadeIn(transitionTime);
        $('#slideshow-back').fadeIn(transitionTime);
        $('#slideshow-play').fadeIn();
        intervall = setInterval("$.intervall();",showTime);
    });
    
    $.intervall = function(){
        slideSwitch(1);
    }
    
    $('#slideshow-back').click(function() {
        slideSwitch(-1);
    });

    $('#slideshow-next').click(function() {
        slideSwitch(1);
    });
    
    $('#slideshow-pause').click(function() {
        $('#slideshow-pause').fadeOut();
        $('#slideshow-play').fadeIn();
        clearInterval(intervall);
    });

    $('#slideshow-play').click(function() {
        $('#slideshow-play').fadeOut();
        $('#slideshow-pause').fadeIn();
        intervall = setInterval("$.intervall();",showTime);
    });
      
    function slideSwitch(amount){
        clearInterval(intervall);
        intervall = setInterval("$.intervall();",showTime);
        fadeOut();
        changeCurSlide(amount);
        fadeIn();
    }
    
    function fadeIn(){
        $('#slide'+curSlide).fadeIn(transitionTime);
        $('#slideshow-mask-'+curSlide).fadeIn(transitionTime);
        $('#slide-t1-'+curSlide).fadeIn(transitionTime);
        $('#slide-t2-'+curSlide).fadeIn(transitionTime);
    }
    
    function fadeOut(){
        $('#slide'+curSlide).fadeOut(transitionTime);
        $('#slideshow-mask-'+curSlide).fadeOut(transitionTime);
        $('#slide-t1-'+curSlide).fadeOut(transitionTime);
        $('#slide-t2-'+curSlide).fadeOut(transitionTime);
    }
    
    function changeCurSlide(i){
        curSlide += i;
        if(curSlide >= noOfSlides) curSlide = 0;
        if(curSlide < 0) curSlide = noOfSlides - 1;
    }

    $(document).keydown(function(event){
        switch (event.keyCode) {
            case 37: slideSwitch(-1); break; // "Pfeil nach links"-Taste
            case 38: slideSwitch(-1); break; // "Pfeil nach oben"-Taste
            case 39: slideSwitch(1); break; // "Pfeil nach rechts"-Taste
            case 40: slideSwitch(1); break; // "Pfeil nach unten"-Taste
        }
    });
    
});