Multiple inclusion of custom library function.

I have written a file that takes in a number between -128 and 127 that corresponds with the output of a sensor. -128 represents -1 and 127 represents 127/128. The function is supposed to take an arcsine of this and return it. I am computing the arcsine using a lookup table with -128 = -pi/2 and 127 = 127*pi/256 (slightly less than pi/2).

When I try to make this into a library function I get the following error:

magAcc.cpp.o: In function arcsineLUTFunc(char)': c:/arduino-0021/hardware/tools/avr/lib/gcc/../../avr/include/arcsineLUT.h:8: multiple definition of arcsineLUTFunc(char)’
ADXL345\ADXL345.cpp.o:c:/arduino-0021/hardware/tools/avr/lib/gcc/…/…/avr/include/arcsineLUT.h:8: first defined here
c:/arduino-0021/hardware/tools/avr/bin/…/lib/gcc/avr/4.3.2/…/…/…/…/avr/bin/ld.exe: Disabling relaxation: it will not work with multiple definitions
magAcc.cpp.o:(.data.arcsineLUT1+0x0): multiple definition of `arcsineLUT1’
ADXL345\ADXL345.cpp.o:(.data.arcsineLUT1+0x0): first defined here

The file arcsineLUT.h is

#ifndef arcsineLUTFile
#define arcsineLUTFile

#include "WProgram.h"
char arcsineLUT1[256] = {/*lookup table numbers go here*/};
char arcsineLUTFunc(char index)
	if(index > 127)
		index = 127;
	if(index < -128)
		index = -128;
	return arcsineLUT1[index - -128];

This file is not included anywhere else in my program.

The file that include it is (ADXL345.h)

#ifndef ADXL_h
#define ADXL_h

#include "WProgram.h"
#include <Wire.h>
#include <arcsineLUT.h>
// Lots of #defines

class cADXL345
		//various different member functions and variables
		//various different member functions and variables

#endif // ADXL345_h

The corresponding cpp file is

#include "WProgram.h"
#include "ADXL345.h"
//various different member functions that don't use arcsineLUT.h.

//The function that uses arcsineLUT.h stripped of irrelevant code.
void cADXL345::phiTheta()
	theta = arcsineLUTFunc((char)(128*x)/xs);		
	phi    = arcsineLUTFunc((char)(128*y)/ys);

I have solved the problem.

The array and function needed to go into a .cpp file and the function prototype in the .h file.