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Easiest way to do this is to give these new pics the same name as the ones you are using now, upload the new ones to your server overwritting the old ones.

Refresh your site and you should see them.

You could also consider backing up the old ones in case you want to revert back.

The files are there, I can see them:
http://www.crazygaming.co.tv/skins/gameportal/img/system/