Real-time twitter display?

Does anyone know a way to show live tweets on my homepage? The website has to be very simple with only particular tweets on the subject.

The only thing the site has to do is show tweets on the subject that i pick out, example: i fill in that i only want tweets to be shown about halloween, and all tweets with #halloween will be shown. I don’t want other people to fill in the subject… just me.
Like on this webpage: everyone can fill something in and there is a whole big system behind it. Im looking for an easy way where only I can choose a subject on my own website.

Hopefully someone understand what I mean. It May Be a plugin or html5 or something else. I would also like to know whether it is a lot of work for a programmer and what the costs are.

Thanks in advance!