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Message: [QUOTE="avicalc, post: 4965676"] I need help with the structure of a JavaScript program. My process is as follows: 1) Get JSON data via XMLHttpRequest. 2) When done with the above, process the JSON data which may take up to 3 seconds. 3) Because of the possibility of a time consuming operation, display a simple animation ("Loading...", etc) while the user is waiting. What I need help with is how to control the animation. I know that I need to somehow "fork" the expensive process out to another thread using setTimeout() but I'm not quite sure how to do this either. Also, I somehow need to integrate the display and hiding of the progress bar animation while function called by setTimeout() is running. Any help with the basic structure of this is appreciated. [/QUOTE]