[webkit-dev] Get/Set flash attribute value using webkit

I have an application that uses webkit to play flash files on Mac. I need to know how I can get/set property(attribute) values (like scalemode) for flash using Webkit. For example, if the actionscript of the flash file contains statement like: _global.DesktopWindow.setScaleModeToNoScale(true); How can I get the value of scalemode after the flash file has loaded? I can get attribute value which was set using the html embed tag. Thanks for the help! Mugdha