No need to muck about with javascript - it's all there in the html:
import scraperwiki
import lxml.html
html = scraperwiki.scrape('http://ahr13.mapyourshow.com/5_0/exhibitor_results.cfm? alpha=%40&type=alpha&page=1')
root = lxml.html.fromstring(html)
# get the links
hrefs = root.xpath('//td[@class="mys-elastic mys-left"]/a')
for href in hrefs:
print 'http://ahr13.mapyourshow.com' + href.attrib['href']