Adjust height of browser, image not resize and coords not recalculate

[onetwothere]

Currently this working good, if we just adjust the width and corner of the browser (safari, chrome or firefox).

But, i very newbie, how can i do if image fit 100% of browser's height and width is auto, then if we adjust the height (without adjust the width) of browser then the image resize and coords recalculate?

img[usemap] { border: none; height: 100%; width: auto; }

thanks guys :)