/**
     * Called when the player character comes into the 'zone'
     * of an npc with a talk dialogue
     */
    void OnTriggerEnter(Collider colide)
    {
        if (colide.gameObject.tag == "Player")
        {
            //freeze mouse-look
            firstPerson = colide.gameObject.GetComponent<FirstPersonController> ();
            firstPerson.setInDialogueToggle();

            if(firstPerson.isPlayerDirty()){
                //Initialize conversation values.
                //must be the same length each for this simple dialogue exchange
                NPCTalk[0] = "What do you want, ruffian";
                NPCTalk[1] = "I don't talk to scruffy vagrants";
                NPCTalk[2] = "I only converse with clean people";
                NPCTalk[3] = "";

                PCTalk[0] = "I wonder if you can help..";
                PCTalk[1] = "Please .. have you seen a book..";
                PCTalk[2] = "I must need to wash-up then hmm..";
                PCTalk [3] = "";
            }
            else{
                NPCTalk[0] = "Ah you have cleaned yourself up";
                NPCTalk[1] = "So what was it you wanted";
                NPCTalk[2] = "I think i saw one near the gallery";
                NPCTalk[3] = "";

                PCTalk[0] = "Yes I feel better now";
                PCTalk[1] = "im looking for an old book..";
                PCTalk[2] = "OK thank you";
                PCTalk [3] = "";
            }

            Debug.Log("met player");
            myTalking = true;
            PauseGame ();
        }
    }