compiler error in calling friend function!!??

[aurora]

i declared a friend function in one class...as shown below...

classa.h

class A
{
public: 
friend void friendFunction(void);
void somefunction(void);
.................
}

class A
{
public: 
friend void friendFunction(void);
void somefunction(void);
.................
}

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classa.cpp

void class A::somefunction() 
{
......
friendFunction();
}

void class A::somefunction() 
{
......
friendFunction();
}

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main.cpp

..........
.............
void frienFunction(void)
{
/* function implementation...*/
}

..........
.............
void frienFunction(void)
{
/* function implementation...*/
}

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but i'm getting compiler error saying that "friendFunction not declared in this class"
please help me whats the wrong here!??