I haven't compiled this code, but it should be pretty close

I2C.C file

unsigned char i2c_transmit(unsigned char address, unsigned char *transmit_bytes, unsigned char num_bytes_send)

{

  //extern unsigned char byte1, byte2;
  // if already busy then return current status
  if (i2cstatus & I2C_BUSY) return i2cstatus;

  // now we are busy performing a transfer
  i2cstatus = I2C_BUSYTX;

  // store slave address + W for use in ISR
  slaveaddress = address << 1;

  // transmit start condition
  STA = 1;

  // transmission started
  return I2C_OK;
}

=========================================================================
Defined in i2c.h file

extern unsigned char i2c_transmit(unsigned char address, unsigned char *transmit_bytes, unsigned char num_bytes_send);

=========================================================================

Defined in IO.c file

unsigned char MAX_NUMBYTE_TX = 7;
=========================================================================

Defined in I/O.c

unsigned char transmit_bytes[MAX_NUMBYTE_TX];	//Holds I2C data bytes
						//only
						//Not address

=========================================================================

called from main.c

transmit_bytes[0]=0x03;
i2c_init(0x20, 0); //Set to master with address of 0x20, no general call
i2c_transmit(0x3B, &transmit_bytes, 1);  // send 1 byte
while (i2c_getstatus() & I2C_BUSY);	// wait until complete

transmit_bytes[0]=0x03;
transmit_bytes[1]=0x04;
i2c_init(0x20, 0); //Set to master with address of 0x20, no general call
i2c_transmit(0x3B, &transmit_bytes, 2);  // send 2 bytes
while (i2c_getstatus() & I2C_BUSY);	// wait until complete

transmit_bytes[0]=0xfe;
transmit_bytes[1]=0x04;
transmit_bytes[2]=0x05;
i2c_init(0x20, 0); //Set to master with address of 0x20, no general call
i2c_transmit(0x3B, &transmit_bytes, 3);  // send 3 bytes
while (i2c_getstatus() & I2C_BUSY);	// wait until complete



 

I forgot to mention that your i2c_transmit routine needs to loop on the num_bytes_send parameter to send as many bytes. I think you can manage that part.