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Yes, in some instances they do get to launch a 2nd banner. (My contract with my ad broker prohibits that, btw.) But I've seen other sites that don't refresh the banner. I've been assuming that it's caused by the serving of dynamic pages, but --WHATEVER the cause-- it's a pain.
I expect this is part of their cache-busting routine on the banner serving. I ran into it myself when I was coding an iframes/ilayer swap. Whatever the reason, it's a pain.
NN has been more than a little weak in its implementation of css, and it also has more trouble than MSIE rendering nested tables. The combination can be deadly.
The Standard link you offered creates a style sheet through document.write, but only after running a pretty thorough browser detection script. I'm assuming that therein lies the culprit. Netscape loads the stylesheet info, gets to the bottom of the nested tables and sometimes the initial calculations don't work out, so it redraws the page.
I wouldn't think the ad reloads are intentional, just a by-product of the browser snafu.