Safari times out but Firefox does not

I am using my MacBook Pro on a windows network at the office. It works flawlessly with one exception. If I use Safari as my browser, in inevitably stops loading pages after a few minutes. For example, I can go to www.apple.com and it will load fine. When I click on "support" in then hangs up while trying to load the page. It does not give me an error message, it just continues to try loading the page. If I use Firefox, however, this behavior never happens and it works without problem.
I only have this problem while on my office network. If I use my Macbook on another network, Safari works flawlessly. In fact, this behavior at my office started about 6 months ago, and prior to that Safari worked OK.
So obviously I think the problem has something to do with the way my network is configured at the office. However, my IT people have no clue where to look because the problem is so bizarre.
Does anyone have any idea why Firefox would work but not Safari, on the same network??

I wonder if we can find a pattern in these sites that do not work. By opening the "activity" window in safari it tells us which components of the site are not loading.
Dell.com:
Dell Global
Yahoo mail:
http://ad.yieldmanager.com/pixel?id=175891&t=2%20width=1
Weather.com:
Weather Program
Facebook.com does not even show up in the activity window....this would suggest to me that Safari is not able to find it via DNS.
Since Safari runs on the open source WebKit, I wonder if another WebKit browser would have the same problems, or if the problem is specific to something Safari is doing.
Any apple technicians care to join in the discussion please??
<Edited by Moderator>

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