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While writing your scripts, use the Availability information for each element in the ActionScript dictionary (see ActionScript Dictionary Overview) to determine if an element you want to use is supported by the Flash Player version you are targeting. You can also determine which elements you can use by displaying the Actions toolbox; elements that are not supported for your target version are highlighted in yellow.
If you are creating content for Flash Player 6 or Flash Player 7, you should use ActionScript 2.0, which provides a number of important features that aren't available in ActionScript 1, such as improved compiler errors and more robust object-oriented programming capabilities.
For a review of differences in how certain features are implemented when publishing files for Flash Player 7 versus how the features are implemented in files published for earlier versions of the player, see Porting existing scripts to Flash Player 7.
To specify the player and ActionScript version you want to use when publishing a document, select File > Publish Settings and then make your selections in the Flash tab. If you need to target Flash Player 4, see Using Flash MX 2004 to create content for Flash Player 4.
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