If you deleted the folder from the browser without emptying the trash can then just explore the trash can to find out the missing folder.
If you deleted the folder and emptied the trash can, then I hope you have a good memory and a really fast connection and can redownload all 406 files before your bro notices...

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iMac G4 OSX 10.3.9
RAM 256MB
LW 4.10.5 Basic
ADSL anything from 3 to 8Mbps/around 1024kbps

"Raise your can of Beer on high
And seal your fate forever
Our best years have passed us by
The Golden Age Of Leather"
-Blue Öyster Cult-