Bad new, your site is still infected so you may have cleaned up before but there is still likely to be the vulnerability which allowed the site to be hacked in the first place. Unless you resolve this the site could continue to be reinfected.
Obviously the network shield blocks the site completely because of reports of detections, etc. Without the network shield the web shield alerts as the home page (and probably others) is still infected. avast is not alone in finding the home page suspect,
http://www.virustotal.com/analisis/74eade022b3cba4bc9f437d6f5c60c58b5956b874a68c7073a77867ff1a6c035-1279464076 10/41 detections. Whilst this is a low number there aren't many AVs even looking for these hacks much less detect them.
There is an obfuscated script tag directly after the opening BODY tag (see image1) and this is most likely to be the problem, see image2 for the decoded script creating a hidden iframe tag.