Download youtube without using any software

Hard to find any apps to download youtube? Now you don't need it. Simply download it with
the OK word.

Just type ok in between www. and youtube

For example: http://www.youtube.com/watch?v=sB2jEhDZyBk&feature=popular

to http://www.okyoutube.com/watch?v=sB2jEhDZyBk&feature=popular  (Download in FLV)

to http://www.3.okyoutube.com/watch?v=sB2jEhDZyBk&feature=popular (Download in 3GP)

to http://www.4.okyoutube.com/watch?v=sB2jEhDZyBk&feature=popular (Download in MP4)

Note: OK can be UPPERCASE.