Why are certain websites causing my mac to crash?

I have recently just purchased my first mac and on the whole am very happy with it. However when browsing the internet certain web pages cause my mac to become unresponsive. All my software is up to date. The problem occurs when i'm using safari and so far it's just 4OD (channel4.com) and myspace that have caused this problem. The mouse either freezes completely or turns into the spinning colour wheel and the keyboard shortcut for force quit does not work. I cannot use the dashboard as it doesn't appear even if I can move the mouse over to its area and the time in the top right corner of the screen stops too. All i can do is hold down the power key and then reboot the whole thing. Any ideas as to what might be causing this? Also I looked at the crash reports to see what they said and there aren't even any there!

Make sure you have the latest version of Adobe Flash Player:
http://get.adobe.com/flashplayer/

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Why are certain websites causing my mac to crash?

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