keepbusy 0 Light Poster

My website validates as XHTML Strict and I want to keep it that way. Therefore, I have always used JavaScript Ads instead of iFrame Ads because the iFrame tag is not supported by XHTML Strict. I've noticed the JavaScript Ads have been slowing down my site - so I'd like to load them last. I've read that with XHTML Strict you can use the Object tag as a substitute for the iFrame tag. Has anyone attempted this? If I create a separate htm page containing a JavaScript tag and call it through the Object tag will it function properly (anytime I throw a JavaScript Ad tag into a blank html page I always get crap Ads back - assuming they can't crawl the page for content). Any ideas?