Please don't listen to the poster above you. He is going all over the linux sections and posting useless information. You have a couple of options. I would guess that you have a couple of options. One is to install Adobe's flash which I guess that you have already tried. If you can't get it from the website. I think that you can get it from Synaptic Package Manager.
The second option is to download gnash
. This is a free alternative to Adobe's flash. It is created by the GNU project, which also helps to create linux. There is a little bit more work involved but if you can install gnash then you can install anything.