Here are the websites where you will find the answers to your questions for the webquest:
http://halloween.sitespourenfants.com/origines.pdf
http://fr.canoe.ca/halloween2002/histoire/index.html
http://www.halloween.tm.fr/default.asp?fichier=/origines.asp
When you are finished, go here to take the quiz:
http://www.lespagesjuniors.com/dossier/quiz/dossier/Halloween
And play with the wordsearch here:
http://www.internetfamilyfun.com/games/wshalloween.htm