var totalSlides = 0;
var currentSlide = 1;
var contentSlides = "";

$(document).ready(function(){
  $("#slideshow-previous").click(showPreviousSlide);
  $("#slideshow-next").click(showNextSlide);
  
  var totalWidth = 0;
  contentSlides = $(".slideshow-content");
  contentSlides.each(function(i){
    totalWidth += this.clientWidth;
    totalSlides++;
  });
  $("#slideshow-holder").width(totalWidth);
  $("#slideshow-scroller").attr({scrollLeft: 0});
  updateButtons();
});

function showPreviousSlide()
{
  currentSlide--;
  updateContentHolder();
  updateButtons();
}

function showNextSlide() {
  currentSlide++;
  updateContentHolder();
  updateButtons();
}

function updateContentHolder()
{

  var scrollAmount = 0;
  contentSlides.each(function (i) {
      if (currentSlide - 1 > i) {
          scrollAmount += this.clientWidth;
      }
  });
  $("#slideshow-scroller").animate({scrollLeft: scrollAmount}, 1000);
}

function updateButtons() {
    if(currentSlide < (totalSlides - 2)) {
        $("#slideshow-next").show();
    } else {
        $("#slideshow-next").hide();
    }
    if(currentSlide > 1) {
        $("#slideshow-previous").show();
    } else {
        $("#slideshow-previous").hide();
    }
}