$(function(){
  // Loop through all the sets of before and after pics
  $(".beforeafter").each(function(){
    // Set the container's size to the size of the image
    $(this).width($(this).find("img[rel=before]").attr("width")).height($(this).find("img[rel=before]").attr("height"));
    // Convert the images into background images on layered divs
    $(this).append("<div class='after'></div>").find(".after").css({"background": "url(" + $(this).find("img[rel=after]").attr("src") + ")", "width": $(this).find("img[rel=after]").attr("width") + "px", "height": $(this).find("img[rel=after]").attr("height") + "px"});
    $(this).append("<div class='before'></div>").find(".before").css({"background": "url(" + $(this).find("img[rel=before]").attr("src") + ")", "width": $(this).find("img[rel=before]").attr("width") - 40 + "px", "height": $(this).find("img[rel=before]").attr("height") + "px"});
    // Add a helpful message
    $(this).append("<div class='help'> </div>");
    // Remove the original images
    $(this).find("img").remove();
    // Event handler for the mouse moving over the image
    $(this).mousemove(function(event){
      // Need to know the X position of the parent as people may have their browsers set to any width
      var offset = $(this).offset().left;
      // Don't let the reveal go any further than 50 pixels less than the width of the image
      // or 50 pixels on the left hand side
      if ((event.clientX - offset) < ($(this).find(".after").width() -14) && (event.clientX - offset) > 14) {
        // Adjust the width of the top image to match the cursor position
        $(this).find(".before").width(event.clientX - offset);
      }
      
    });
    // Fade out the help message after the first hover
    $(this).hover(function(){
      $(this).find(".help").animate({"opacity": 0}, 400, function(){$(this).find(".help").remove();});
    });
  });
});