Spotty minmax.js in WP?

Hello all!

I’ve used the minmax.js script (http://www.doxdesk.com/software/js/minmax.html) with decent results on other non-WP sites, and thought I would be able to use it on our new WP installation to mitigate the problems some of our contributors were having viewing the site on small screens. I’ve added min-width and max-width attributes to the stylesheet to keep column content from bumping down below sidebar content.

It works like an absolute charm on our homepage:
http://martinirepublic.com (try viewing in a very small IE window to see the effect)

However, if you visit one of the posts or pages (try http://www.martinirepublic.com/item/the-overnighter-2/ ), it doesn’t work at all. The script appears in the source code, just like on the front page, but it doesn’t get applied for some reason.

I have tried everything I can think of and just can’t figure out what might be causing this. Could it be a fancy permalink thing? Or something in .htaccess? Could it be that the script is in the root and the stylesheet is elsewhere? Has anyone else experienced this? Is anyone else using minmax.js with good results? If so, where does the script reside? Are there other options for me to force IE to simulate min- and max-width?