// SET THIS VARIABLE FOR DELAY, 1000 = 1 SECOND
var delayLength = 4000;

function doMove(panelWidth, tooFar) {
  var leftValue = $("#mover").css("left");
  
  // Fix for IE
  if (leftValue == "auto") { leftValue = 0; };
  
  var movement = parseFloat(leftValue, 1000) - panelWidth;
  
  if (movement == tooFar) {
    $(".slide img").animate({
      "top": -197
    }, function() {
      $("#mover").animate({
        "left": 0
      }, function() {
        $(".slide img").animate({
          "top": 0
        });
      });
    });
  }
  else {
    $(".slide img").animate({
      "top": -197
    }, function() {
      $("#mover").animate({
        "left": movement
      }, function() {
        $(".slide img").animate({
          "top": 0
        });
      });
    });
  }
}

$(function(){
  
  var $slide1 = $("#slide-1");
  
  var panelWidth = $slide1.css("width");
  var panelPaddingLeft = $slide1.css("paddingLeft");
  var panelPaddingRight = $slide1.css("paddingRight");
  
  panelWidth = parseFloat(panelWidth, 10);
  panelPaddingLeft = parseFloat(panelPaddingLeft, 10);
  panelPaddingRight = parseFloat(panelPaddingRight, 10);
  
  panelWidth = panelWidth + panelPaddingLeft + panelPaddingRight;
  
  var numPanels = $(".slide").length;
  var tooFar = -(panelWidth * numPanels);
  var totalMoverwidth = numPanels * panelWidth;
  $("#mover").css("width", totalMoverwidth);
  
  $("#slider").append('<a href="#" id="slider-stopper">Stop</a>');
  
  sliderIntervalID = setInterval(function(){
    doMove(panelWidth, tooFar);
  }, delayLength);
  
  $("#slider-stopper").click(function(){
    if ($(this).text() == "Stop") {
      clearInterval(sliderIntervalID);
       $(this).text("Start");
    }
    else {
      sliderIntervalID = setInterval(function(){
        doMove(panelWidth, tooFar);
      }, delayLength);
       $(this).text("Stop");
    }
     
  });
  
});