Valid XHTML page cannot be correctly displayed

[PNGaetor]

http://www.mozilla.org/start/1.0/demos/eagle-sun.html

This site is valid, so there certainly are not mistakes.
Why I cannot it view correctly with my IE6?

 

[C. A. Upsdell]

http://www.mozilla.org/start/1.0/demos/eagle-sun.html

This site is valid, so there certainly are not mistakes.
Why I cannot it view correctly with my IE6?

IE does not support standard PNG alpha transparency.