var popupTargetUrl = "http://www.nxtbook.com/nxtbooks/abwa/2010_districtconference_icon/index.php#/0";
  var openInNewWindow = true;
  
  var leftStopPosition = "575px";
  var bottomStopPosition = "510px";
  var fadeDurationInSeconds = 500;
  var slideAnimationDurationInMillis = 2000;
  
  
  $(document).ready(function(){
	setImage();
	slideImage();
  });
	  
  function setImage() {
	  $("#slidingPopup").html("<img src='" + slidingPopupImages[getImageIndex()].src + "' usemap='#popupImageMap' style='border: none;' />");
  }
  
  function getImageIndex() {
	  return getRandomNumber(slidingPopupImages.length);
  }
  
  function getRandomNumber(maximum) {
	  return Math.floor(Math.random()*maximum);
  }
  
  function slideImage() {
	  var slideChooser = getRandomNumber(2);
	  
	  if (slideChooser == 0) {
	    slideFromLeft();
	  }
	  else {
	    slideFromBottom();
	  }
  }
  
  function slideFromLeft() {
	  $("#slidingPopup").addClass("leftStartPosition");
	  $("#slidingPopup").animate({left: leftStopPosition}, slideAnimationDurationInMillis).idle(getFadeDurationInMillis());
  }

  function slideFromBottom() {
	  $("#slidingPopup").addClass("bottomStartPosition");
	  $("#slidingPopup").animate({top: bottomStopPosition}, slideAnimationDurationInMillis).idle(getFadeDurationInMillis());
  }
  
  function getFadeDurationInMillis() {
	  return fadeDurationInSeconds * 1000;
  }
  
  (function($){
	  jQuery.fn.idle = function(time){
		  var i = $(this);
		  i.queue(function(){
			  setTimeout(function(){
				  fade();
				  i.dequeue();
			  }, time);
		  });
	  };
  })(jQuery);
  
  function fade() {
	  $("#slidingPopup").fadeOut("fast");
  }
  
  function navigateToSite() {
	  window.location = popupTargetUrl;
  }
  
  function closePopup() {
	  document.getElementById("slidingPopup").style.display = 'none';
  }