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Problem when including header file

Oswld (18)
Hello,

I am currently working with graphics. I'm compiling using unix and xming for the output. I am supposed to create a window with different buttons, each button linked to an action. These actions are from another program; this program created a database of students each with their own grade, id and name which the program read from a file and it store them. the difference is that that did not use graphics.
An example of the actions would be:
Create a student. Search for a student.
Now, i am trying to combine the mentioned program with the one im creating and everything is ok until this point

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#ifndef PROJECT_WINDOW_GUARD
#define PROJECT_WINDOW_GUARD 1

#include "GUI.h"
#include "Graph.h"

using namespace Graph_lib;

struct Project_window : Window {
	Project_window(Point xy, int w, int h, const string& title );
	
private:
	
	Button exit_button;
	Button load_button;		//Done
	Button add_button;		//Done	
	Button search_button;	//Done
	Button erase_button;	//Done
	Button display_button;	
	Button statistics_button;
	
	void exit();			
	void load();
	void add();
	void search();
	void erase();
	void output();
	void statistics();
	
	static void cb_exit(Address, Address);
	static void cb_load(Address, Address);
	static void cb_add(Address, Address);
	static void cb_search(Address, Address);
	static void cb_erase(Address, Address);
	static void cb_display(Address, Address);
	static void cb_statistics(Address, Address);
};

//--------------------------------------------------------------------------------------------------

struct Load_window : Window {
	Load_window(Point xy, int w, int h, const string& title );
	
private:
	
	In_box read;
	Button ok_button;
	Button cancel_button;
	
	void ok();
	void cancel();
	
	static void cb_ok(Address, Address);
	static void cb_cancel(Address, Address);
};

//--------------------------------------------------------------------------------------------------

struct Search_window : Window {
	Search_window(Point xy, int w, int h, const string& title );
	
private:
	
	In_box search;
	Out_box result;
	Button ok_button;
	Button cancel_button;
	
	void ok();
	void cancel();
	
	static void cb_ok(Address, Address);
	static void cb_cancel(Address, Address);
};

//---------------------------------------------------------------------------------------------------
struct Add_window : Window {
	Add_window(Point xy, int w, int h, const string& title );
	
private:
	
	In_box first_name;
	In_box last_name;
	Button ok_button;
	Button cancel_button;
	
	void ok();
	void cancel();
	
	static void cb_ok(Address, Address);
	static void cb_cancel(Address, Address);
};
//---------------------------------------------------------------------------------------------------
struct Display_window : Window {
	Display_window(Point xy, int w, int h, const string& title );
	
private:
	
	In_box choice;
	Out_box first_name;
	Out_box last_name;
	Button ok_button;
	Button cancel_button;
	
	void ok();
	void cancel();
	
	static void cb_ok(Address, Address);
	static void cb_cancel(Address, Address);
};
//---------------------------------------------------------------------------------------------------
struct Erase_window : Window {
	Erase_window(Point xy, int w, int h, const string& title );
	
private:
	
	In_box first_name;
	In_box last_name;
	Button ok_button;
	Button cancel_button;
	
	void ok();
	void cancel();
	
	static void cb_ok(Address, Address);
	static void cb_cancel(Address, Address);
};
//------------------------------------------------------------------------------
#endif


After that, when i just include a header file from the previous one(ex):

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#ifndef _STUDENT_H_
#define _STUDENT_H_


#include "std_lib_facilities.h"

class Student{
	public:
	
	Student(){}
	Student(string f, string l, string i)
		:firstName(f), lastName(l), ID(i){}
	
	string get_ID(){return ID;};
	string get_lastName(){return lastName;};
	string get_firstName(){return firstName;};
	
	void display(){ cout << firstName<< " " <<lastName<< " " << ID << endl;};
	
	friend ostream & operator<<(ostream &stream, Student s);
	
	private:
	
	string firstName;
	string lastName;
	string ID;
	
};

ostream &operator<<(ostream &stream, Student s)
{
	stream << s.firstName << " ";
	stream << s.lastName<< " ";
	stream << s.ID << " " <<endl;

	return stream;	
}
#endif


It sends out an error saying numerous and different things for each one, for this one specifically it says:

/tmp/ccfB8Jv3.o(.text+0x0) In function 'operator<<(std::basic_ostream<char, std::char_traits<char> >&, Student)':
multiple definitions of 'operator<<(std::basic_ostream<char, std::char_traits<char> >&, Student)'
/tmp/ccfp3ZiY.o(.text+0x0): first defined here.

I dont know why it says that. Both the program that im working on and the program that contains this header file work correctly.

A help in this matter would be really appreciated!
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