A simple jQuery snippet to swap the image source / attribute on load:-

jQuery(function($) {
    //caches a jQuery object containing the image element
    var branding = $(".your-class img");
function swapImage() {
          branding.attr('src', '/dir/image.png');
        }
  swapImage();
});

About the Author

Glenn

A highly experienced Web Developer (WordPress, Webflow, Weebly & Custom), Front-end / Back-end Developer & New Media Specialist, with extensive knowledge of a wide spectrum of technologies in the Development and Creative Industries, built up over a number of years.