Could someone provide the code for this?

Let s say I have five words: cow- dog and rabbit- cat and horse.

I want to put them in an array and I want to print only 3 of them randomly and do not want them to repeat. How can I write this in Javascript ( I DO NOT WANT ANY DUPLICATES )

i was watching videos on youtube then suddenly i opend an other video link it says
"Hello- you either have JavaScript turned off or an old version of Adobe s Flash Player. Get the latest Flash player. "

now i went back to the videos i ve seen a min ago. it gives the same message

wat to do... ."in modzilla its working but i do t want to use it.. i want only ie to open youtube pls help
no thanx all for answer but i told you it was working befour.. so it wasn t the flash or script problem...i just delete cookees and its now ok..
thanx for the answer.

I have heard a lot of times that JAVASCRIPT IS used for spamming...
IF yes- then can the following process be done by JAVASCRIPT :-

1) got to a website (social networking)
2) login with my username n password
3) go to blogs area
4) open someone s blog
5) click on ADD COMMENT link
6) write the comment and press SUBMIT button to add the comment to the blog post.

And y don t people who know JAVASCRIPT do it?
I heard that its almost impossible to catch tthese kind of spammers....What is the level of truth in it????

I want to try it....can i get caught?....if yes how to not get caught?

I m trying to make a link to resize an image- and it s not working.

Could someone look at my code and see if it s ok?

http://itsjareds.scienceontheweb.com/example.html
**EDIT**

BROKEN LINK- HERE S THE REAL LINK

http://itsjareds.scienceontheweb.net/example.html

when i checked youtube it says "Hello- you either have JavaScript turned off or an old version of Macromedia s Flash Player. Click here to get the latest flash player." I already downloaded macromedia flash player for how many times- I also tried tools then internet options and active scripts are on and I reinstall javasript and I still cant watch youtube videos.

how can i watch again?
please help me

I have heard a lot of times that JAVASCRIPT IS used for spamming...
IF yes- then can the following process be done by JAVASCRIPT :-

1) got to a website (social networking)
2) login with my username n password
3) go to blogs area
4) open someone s blog
5) click on ADD COMMENT link
6) write the comment and press SUBMIT button to add the comment to the blog post.

And y don t people who know JAVASCRIPT do it?
I heard that its almost impossible to catch tthese kind of spammers....What is the level of truth in it????

I m leanching my own social networking website so please tell what measures to take to prevent spammers?