Weird Firefox quirk when running applet

Hi Guys,

I'm new to Java and still learning the basics. Am learning about writing applets and have discovered a weird quirk when running them in Firefox. If I have the browser window, directly ontop of the desktop (i.e. no other windows underneath it), my desktop wallpaper show through where ever text has been generated. If the then hover that same browser window over another window the image fills the whole of the applet box. However this does not happen in IE. Have attached screen grabs. Was largely just curious as to what exactly causes this to happen and how I can prevent it happening on applets I develop in the future.

Thx
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To get better help sooner, post a SSCCE (Short, Self Contained, Compilable and Executable) example that demonstrates the problem.

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