g++ error : Nested template classes

[BJP]

Following is my nested template class:

template <class T>
class A
{
public:
typedef std::pair<A,T> Pair;
A();
~A();
bool add( const T& val );

protected:
template <class T>             //Line 11: error line
class B
{
T&  getvalue();
void setvalue(const T& val);

};
typedef B<T> Node;
private:
....
};

when I try to build using gcc 3.3.2, it gives me error on Line: 11
saying "shadow class T"

Any Idea why, works with Visual Studio C++.

So then I change Line 11 to say "template <class Z>", which worked.

Question is do I have to change all instance of "T" to "Z" in class B
i.e. function getvalue and set value looks like
Z& getvalue()
void setvalue(const Z& val);

or is it ok to keep as it is? i.e.
T& getvalue()
void setvalue(const T& val);