//First, we create an array of 'pictures', showing each state of the hangman
picture=new Array("--------\n|      |\n|\n|\n|\n|\n=====",
                   "--------\n|      O\n|\n|\n|\n|\n=====",
                   "--------\n|      O\n|      |\n|\n|\n|\n=====",
                   "--------\n|      O\n|     /|\n|\n|\n|\n=====",
                   "--------\n|      O\n|     /|\\\n|\n|\n|\n=====",
                   "--------\n|      O\n|     /|\\\n|      |\n|\n|\n=====",
                   "--------\n|      O\n|     /|\\\n|      |\n|     /\n|\n=====",
                   "--------\n|      O\n|     /|\\\n|      |\n|     / \\\n|\n=====");
//Next, we create an array of words for the computer to choose from
vocabulary=new Array("Macquarie","JavaScript","Education","Navigator","blackboard");
//this function initialises all the variables, and chooses a word from the list
function restart(){
  numguesses=0;
  maxguesses=picture.length-1;//if there are 7 pictures, the last one must show the complete hangman, so the user must lose the game at that point
  guessed=" ";
  len=vocabulary.length;//determine number of words in list
  theWord=vocabulary[Math.round(len*Math.random())].toUpperCase();//pick a word at random, convert it to uppercase
  displayPicture();//calls the function to draw the gallows(at this point empty)
  displayWord();//displays the current state of the word(at this point all blanks)
  displayGuessed();//lists all the letters you have guessed so far(at this point none)
}
function displayPicture(){
  hangForm.drawing.value=picture[numguesses];//draw the appropriate picture for the number of incorrect guesses made
}
function displayGuessed(){
  hangForm.guessed.value=guessed;
}
function displayWord(){
  output="";
  for(i=0;i<theWord.length;i++){		//step through each character in the target word
    if (guessed.indexOf(theWord.charAt(i)) !=-1)//if the character appears in the 'guessed' list
      output += (theWord.charAt(i)+" ")		//display that letter in the 'word to guess' box
    else output += "_ "				//otherwise put a blank in its place
  }
  hangForm.word.value=output;
}
function badGuess(s){
  if (theWord.indexOf(s) == -1) return true	//if the guessed letter does not appear in the word, return a value of TRUE to the calling function
  return false					//otherwise return FALSE
}
function winner(){
  for (i=0;i<theWord.length;i++){				//step through each letter in the word
    if(guessed.indexOf(theWord.charAt(i)) == -1) return false	//if any letter has not been guessed yet, return a value of FALSE
  }
  return true							//otherwise, return TRUE
}
function guess(s){
  if(guessed.indexOf(s) ==-1) guessed+=s	//if letter hasn't been guessed already, add it to the list
  if(badGuess(s)) numguesses++			//if guess is incorrect, increment numguesses
  displayPicture();				//redraw gallows
  displayWord();				//redisplay word to be guessed
  displayGuessed();				//redisplay guessed letters
  if(numguesses>=maxguesses){			//if user runs out of guesses
    alert('Sorry, you lose. The word was ' +theWord);	//put them out of their misery and tell them what the word was
    restart();						//then start over with a new word
  }
  if(winner()){		//if all letters in word have been guessed
    alert('You Win!');	//congratulate user
    restart();		//then start again with a new word
  }
}