Embed games???

Hello,

I’m try to embed few games from miniclip.com
I try to put code to CODE FORM into post.

After I do that I get my site in very bed condition.

I get same problem when I edit post wich have YOUTUBE embed. For youtube I find some plugin so that isn’t critical for now.

For now I would like to have some plugin for embeding games or there is some other problem with my site…? I try to put code under game code tags but I get same problem.

My site is http://www.veseli-andrija.com
I don’t have any games there because of problem described above.

Please, if You have any information about that…
Thanks