Aligning 3 Column DIV


CSS and DIV layout, 

I have three columns - in effect 3 divs, which do not by default have anyway of seeking the maximum height between the 3 and making them all the same. Normalizing it.

common problem, for which there is umpteen scripts for aligning of divs within a layout.

Searching high and low, why my script worked in IE6,IE7 but not FF, came to a conclusion when I found out that if I add
div.style.height = height + 'px'; to the mix it would work.

That is by adding px at the end, it resizes in FF, else it ignores.

This solved it for me, but is this really a fact?