new block: spelling bee (spell the english word you just heard)

Students are presented with an English word they should hear (audio using flash)
students can choose one of the tree difficulty levels for words.
then, they are asked to type in the word they heard and check the spelling.

pressing the "new word" button retrieves a new word from the dictionary

the block's code is based on a http://www.thefreedictionary.com/ igoogle free service.

updated link: http://www.tikshuv.org.il/moodle/contrib/blocks/spelling_bee.tar.gz