Checked 4412_standard.jpg link with DrWeb link checker and avast no detection
Also 4b/4b5m_standard.jpg, 4b/4b5p_large.jpg, ImageLibrary/40724_3.jpg.
The google one is weird as that doesn't show a file other than the avast unpxxxx unpack file, so I can't test that.
Also checked livestats_v1_1.js?noccache3 no alert on DrWeb. Since I use firefox and use NoScript .js don't run by default, but I was able to open the .js page and download it no avast alert.
Also was able to open and download, masthead_2006/funcs.js, avast.com/dynmenu.js, these were all scanned by ashQuick.exe and no detections.
So I wasn't able to find anything in those files, so there might be something else going on with your system.
I suggest you schedule a boot-time scan.
If you haven't already got this software (freeware), download, install, update and run it, preferably in safe mode.
1.
Ewido, a.k.a. avg anti-spyware If using winXP. or
a-Squared free if using win98/ME.