Where exactly (as I get no alert on that page) ?
Check the avast! Log Viewer (right click the avast 'a' icon), Warning section, this contains information on all avast detections. C:\Program Files\Alwil Software\Avast4\ashLogV.exe - Or check the source file using notepad C:\Program Files\Alwil Software\Avast4\DATA\log\Warning.log
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When posting URLs to suspect sites, change the http to hXXp (or www to wXw), so the link isn't active (clickable) avoiding accidental exposure.