I had never used iframes until I switched jobs and was tasked with upgrading a legacy application with literally hundreds of lines of javascript on many of the

I had never used iframes until I switched jobs and was tasked with upgrading a legacy application with literally hundreds of lines of javascript on many of the html pages- frequently set to run on onload(). Because a full rewrite was not an option- iframe came to be my salvation. Ajax just wouldn't have cut in this scenario.