Image Resizing Without Losing Resolution

Can anyone point me in the right direction on how to achieve
this...
http://www.janisbreslin.com/
...specifically the full browser window sized images that
scale when the browser is re-sized without losing resolution.
Thanks in advance.

There no way to perfectly maintain resolution of a bitmap
while scaling, but setting the
smoothing
property to
true drastically improves the interpolation when
scaling.

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