Here is a tutorial that helps you to develop a simple Flash predloader using Flash MX 2004 and ActionScripting in easy step-by-step practice.

Step1 : Open macromedia flash MX, open the flash file that you have designed. To incorporate preloader to it, add a scene to it, ny selecting the Window -> scene menu.

Step2 : Rename the newly added scene as "preload" as show below

Step3 : Drag the scene and place it at the top if the window.

Step4 : Add a key frame and add a layer containing key frame with words "Loading"

Step5 : Create Motion Tween for the frame.

Step6 : Add a new layer above this layer. in the first frame right click and under actions pane add the following.

Step7 : Under the Actions section add the below given code.

Step9: Under the actions the below given code.

Step 10: Now run the flash file by pressing CTRL+ENTER. The flash intro that you have prepared will run. To play the flash file along with the preloader, click View -> Show Streaming as shown below.

and for more detail click or copy below link...
Here is the complete source file used in the sample, feel free to download and play around.
preloader.zip (3.28)

http://www.macronimous.com/resources/developing_preloaders_in_Flash.asp

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Benny Alexander is the Director of Macronimous web solutions, an India based offshore web development company providing web, PDA and Mobile solutions. More information about the author and his business can be found at http://www.macronimous.com

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Benny Alexander is the Director of Macronimous web solutions, an India based offshore web development company providing web, PDA and Mobile solutions. More information about the author and his business can be found at http://www.macronimous.com

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About author:

Benny Alexander is the Director of Macronimous web solutions, an India based offshore web development company providing web, PDA and Mobile solutions. More information about the author and his business can be found at http://www.macronimous.com