Trj reported for a good website

Hi sir,
When I open the website http://www.espeedpost.com, my avast reports virus:
JS:ScriptIP-inf[Trj]
But through the source code, I could not find any code including virus.
I need help on this case, how shoud I modify the web site code.
Thank you!!

I get nothing with online scanners, is your avast! updated ?
can you post a screenshot of the popup

VirusTotal - index.html
http://www.virustotal.com/file-scan/report.html?id=69d50c399e1ac0f326ca8af80bb6580ed42f870fae3dbab78590970641da7232-1287488223

NoVirusThanks - CLEAN
http://scanner2.novirusthanks.org/analysis/c5fa31c3f78e577f9086a622a1a65b05/aW5kZXg=/

Thanks for your help.
Please refer to the attached screenshot.

Have now entered the website with my avast! pc

And i get the warning with IE8, but nothing if i use chrome or Opera

and only detected by avast!
VirScan - unp33621300.tmp 1/36
http://virscan.org/report/77d1c0b03b21b447499b36c53e6053bd.html

EDIT: just tried again with IE8…no warning ??? …hmmmm did i just recive an update ?

No code is updated on this website.
It’s a big problem for me, I have visitors who use Avast telling me the website is not safe, but I do not know which code causes the problem.