title: How multiple scripts run without webworkers?
body: <p>I am learning web-workers and found that we can run multiple scripts now on web pages. This is quite interesting but one thing again came in to my mind was If we can't run multiple scripts before html web-workers, How did I run several slideshows on a single html page without using above technology.
  I may not properly understand this concept. Can anyone explain how I ran several slideshows which was designed from only JavaScript without web-workers?</p>