From technical point of view, it is not an ideal 404 page because:
1- 404 pages should be small in size not to consume bandwidth unnecessarily as they are among the most frequently called pages of a website.
2- They must not involve SQL queries for the same reason to not to increase server load.
3- javascript, dhtml, flash etc. are not suggested in 404 pages as the message they try to deliver (ie page address is wrong) can be missed by certain browsers/search engines.
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