I  made a simple button in Flash. Normal actionscript of get URL is attached to the button. Now the script was working fine till date. It used to call the respective html page when clicked on it. I had exported the button in which the actionscript version was 1 in publish settings. Now today I downloaded the Flash player 9.0 plugin, I found that the actionscript of get URL doesn’t work. Is there any settings which we need to do after we download the flashplayer 9.0.

” In Flash Player 9, calling getURL(or its ActionScript 3.0 equivalent, navigateToURL) with a window name of “_self,” “_parent,” or “_top” will no longer work when the calling Flash Player movie (SWF) file is located in a different domain than its hosting HTML page, or when the HTML parameter AllowScriptAccess is set to “never.”

This may interfere with the abilities of some SWF files to change the web browser location that a user is looking at.” — from Adobe.com. Read more. 

On Actionscript Migration read more.