We would like to create HTML pages on our ecommerce website that is hosted by Network Solutions. Each of these pages will need to have our header/menu and footer that will change from time to time. Unfortunately our platform doesn't have PHP installed on its servers and I am not able to upload PHP files to the file manager.
What is my the best option for having a dynamic header? We are looking to have an SEO friendly solution if possible, and I'm not sure of a way to use jQuery or Javascript while also being SEO friendly and loading all of the HTML code on the same page.