Arduino project IR controlled LED's

Using Arduino LEDs and Multiplexing
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Hi there guys! I've spent part of my holidays to make this project for my school. But i think it's kind of begginer-like. So if anyone could help me to enhance it a little bit... With the help of the almighty internet and couple of manuals i've managed to set up theese two codes.

#include <IRremote.h> //adds the library code to the sketch
const int irReceiverPin = 2; //pin the receiver is connected to
const int ledPin = 13; 
IRrecv irrecv(irReceiverPin); //create an IRrecv object
decode_results decodedSignal; //stores results from IR detector
void setup()
{
    pinMode(ledPin, OUTPUT);
    irrecv.enableIRIn();
}
boolean lightState = false;
unsigned long last = millis();
// Start the receiver object
//keep track of whether the LED is on
//remember when we last received an IR
void loop()
{
    if (irrecv.decode(&decodedSignal) == true) //this is true if a message has been received
    {
        if (millis() - last > 250) {
            //has it been 1/4 sec since last message
            lightState = !lightState;
            //toggle the LED
            digitalWrite(ledPin, lightState);
        }
        last = millis();
        irrecv.resume();
        // watch out for another message
    }
}

#include <IRremote.h>
// IR remote control library
const int numberOfKeys = 1;
const int firstKey = 4;
// the first pin of the 5 sequential pins connected to buttons
boolean buttonState[numberOfKeys];
boolean lastButtonState[numberOfKeys];
long irKeyCodes[numberOfKeys] = {
    0x18E758A7, //0 key
};
IRsend irsend;
void setup()
{
    for (int i = 0; i < numberOfKeys; i++){
        buttonState[i]=true;
        lastButtonState[i]=true;
        int physicalPin=i + firstKey;
        pinMode(physicalPin, INPUT);
        digitalWrite(physicalPin, HIGH); // turn on pull-ups
    }
    Serial.begin(9600);
}
void loop() {
    for (int keyNumber=0; keyNumber<numberOfKeys; keyNumber++)
    {
        int physicalPinToRead=keyNumber+4;
        buttonState[keyNumber] = digitalRead(physicalPinToRead);
        if (buttonState[keyNumber] != lastButtonState[keyNumber])
        {
            if (buttonState[keyNumber] == LOW)
            {
                irsend.sendSony(irKeyCodes[keyNumber], 32);
                Serial.println("Sending");
            }
            lastButtonState[keyNumber] = buttonState[keyNumber];
        }
    }
}

As you can see first code is receiver second is sender. So... any sugestions what should i do to make it better?

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