Replaces the title and all images with class="retina" in a WP blog that uses Pagelines theme

pagelines-retina.js

//logic shamelessly copied from https://github.com/imulus/retinajs

jQuery(document).ready(function() {
  var replaceRetina = function(elem) {
    if (elem.complete) {
      var src = elem.src;
      var path_segments = src.split('.');
      var path_without_extension = path_segments.slice(0, (path_segments.length - 1)).join(".");
      var extension = path_segments[path_segments.length - 1];
      elem.setAttribute('width', elem.offsetWidth);
      elem.setAttribute('height', elem.offsetHeight);
      elem.setAttribute('src', path_without_extension + "@2x." + extension);
    } else {
      setTimeout(function() { replaceRetina(elem) }, 5);
    }
  }
  if (window.devicePixelRatio > 1) {
    jQuery(".mainlogo-img, .retina").each(function(i) {
      replaceRetina(this); 
    });
  }
});