Sporadic no internet access in Safari, Skype works

Hey guys,
First - sorry for my poor english. I switched to Mac some months ago, i have the newest type of a Macbook pro. It is connected by Wireless Lan (100Mbit) to the internet.
I have following problem:
Often i cannot load a page (google.com or ebay.com), or it is not completely loaded. In this time Skype is working without any problems (video chat). I tried to install Google Chrome to see if Safari makes the problem, but also here i get this effect.
Does somebody has a suggestion for me how i can find the problem? In Windows systems i know some ways like check in the task manager the usage of the network adapter
Achim

Safari 5.0.1 or later: Slow or partial webpage loading, or webpage cannot be found

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