// JavaScript Document

<!--JAVASCRIPT NEEDED FOR SLIDESHOW4-->


$(document).ready(function(){
  var currentPosition4 = 0;
  var slideWidth4 = 500;
  var slides4 = $('.slide4');
  var numberOfSlides4 = slides4.length;

  // Remove scrollbar in JS
  $('#slidesContainer4').css('overflow', 'hidden');

  // Wrap all .slides with #slideInner div
  slides4
    .wrapAll('<div id="slideInner4"></div>')
    // Float left to display horizontally, readjust .slides width
	.css({
      'float' : 'left',
      'width' : slideWidth4
    });

  // Set #slideInner width equal to total width of all slides
  $('#slideInner4').css('width', slideWidth4 * numberOfSlides4);

  // Insert controls in the DOM
  $('#slideshow4')
    .prepend('<span class="control4" id="leftControl4">Clicking moves left</span>')
    .append('<span class="control4" id="rightControl4">Clicking moves right</span>');

  // Hide left arrow control on first load
  manageControls(currentPosition4);

  // Create event listeners for .controls clicks
  $('.control4')
    .bind('click', function(){
    // Determine new position
	currentPosition4 = ($(this).attr('id')=='rightControl4') ? currentPosition4+1 : currentPosition4-1;
    
	// Hide / show controls
    manageControls(currentPosition4);
    // Move slideInner using margin-left
    $('#slideInner4').animate({
      'marginLeft' : slideWidth4*(-currentPosition4)
    });
  });

  // manageControls: Hides and Shows controls depending on currentPosition
  function manageControls(position){
    // Hide left arrow if position is first slide
	if(position==0){ $('#leftControl4').hide() } else{ $('#leftControl4').show() }
	// Hide right arrow if position is last slide
    if(position==numberOfSlides4-1){ $('#rightControl4').hide() } else{ $('#rightControl4').show() }
  }	
});