Button interrupt millis delay

[who_took_my_nick]

MOD EDIT
Fixed code tags and improved sketch formatting

const int buttonPin = 4;
const int rlyPin = 2;
int buttonState = 0;
int rlyState = 1;
unsigned long previousMillis = 0;
;
const long interval = 1000;
unsigned long currentMillis = 0;
void setup()
{
    pinMode(rlyPin, OUTPUT);
    pinMode(buttonPin, INPUT);
    digitalWrite(rlyPin, LOW);
}
void loop()
{
    buttonState = digitalRead(buttonPin);
    if (buttonState == HIGH)
    {
        if (currentMillis - previousMillis >= interval)
        {
            previousMillis = currentMillis;
            rlyState = LOW;
            currentMillis = millis();
        }
        else
        {
            rlyState = HIGH;
        }
    }
    digitalWrite(rlyPin, rlyState);
}