OK, have done some research on the alert so far. Last popup message will always supersede the prior one so get the one you want while you can if you should ever need help again.

INFO:
http://sitecheck.sucuri.net/results/www.wallpaperfo.com
http://urlquery.net/report.php?id=6596183
https://www.virustotal.com/en/url/18ef2deb123b95f8f2e325b148f3801bb8070e780c83b175873ad37a476571b1/analysis/1381471121/
http://quttera.com/detailed_report/www.wallpaperfo.com
zulu zscaler.com is taking an inordinate amount of time to produce a scan result (over 30 minutes so far) but this is likely due to the high number of links and files present in the link you gave us.
Normalized url site using zulu zscaler here: (not working either)

Seems the .jpeg or .png file you were looking at was infected and/or caused an automatic redirect but that attack or infected file may well not be there anymore. Maybe a Hit and Run?