Before I was using IE expression to implement min-width in IE like Firefox. (Take a look at http://www.gunlaug.no/contents/wd_additions_14.html)
But today I've found the best solution of min/max-width/height for IE.
Just include reference to minmax.js script to your page and use min/max-width/height FF CSS styles.
Corresponding article: http://www.doxdesk.com/software/js/minmax.html