TR1 libraries and ext/hash_map

I have no idea how to use the TR1 library within Visual Studio (2008) and more specifically the <ext/hash_map> libary. If anyone could help me get this to work I would really appreciate it. Everytime I try to #include <ext/hash_map>, the compiler error claims that it cannot find the library.
one, i wouldnt use Visual Studio (2008), and two if you rilly like using Visual Studio (2008) then update its library. it may be in the Tools menu just look for any thing that says update in it.

in your
 
#include <ext/hash_map> 

it needs to be like this
1
2
#include <ext>
#include <hash_map> 

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