If you are able to use PHP that would be the best. Then you could just use this code:<html><head><title>your title</title></head><body><?phpinclude("ForExampleMyBanner.php")?>And here's e.g the article</body></html>And just use that code on each site, and if its a banner you use in there, you could just change the banner url in that file, and it would change on all of your sites that got the include PHP code.