var can_play = true;
var words = new Array("CAT", "DOG", "MOUSE", "RABBIT", "HOURSE", "MISSISSIPPI");

var to_guess = "";
var display_word = "";
var used_letters = "";
var wrong_guesses = 0;


function selectLetter(l)
{
	if (can_play == false)
	{
		return;
	}

	if (used_letters.indexOf(l) != -1)
	{
		return;
	}
	
	used_letters += l;
	document.game.usedLetters.value = used_letters;
		
	if (to_guess.indexOf(l) != -1)
	{
		 // correct letter guess
		pos = 0;
		temp_mask = display_word;


		while (to_guess.indexOf(l, pos) != -1)
		{
			pos = to_guess.indexOf(l, pos);			
			end = pos + 1;

			start_text = temp_mask.substring(0, pos);
			end_text = temp_mask.substring(end, temp_mask.length);

			temp_mask = start_text + l + end_text;
			pos = end;
		}

		display_word = temp_mask;
		document.game.displayWord.value = display_word;
				
			if (display_word.indexOf("*") == -1)
			{
				// won
				alert("Weldone, you have won!");
				can_play = false;
			}
	}
	else
	{
		// incortect letter guess
		wrong_guesses += 1;
		eval("document.hm.src=\"hm" + wrong_guesses + ".gif\"");
				
		if (wrong_guesses == 10)
		{
			// lost
			alert("Sorry, you have lost!");
			can_play = false;
		}
	}
}

function reset()
{
	selectWord();
	document.game.usedLetters.value = "";
	used_letters = "";
	wrong_guesses = 0;
	document.hm.src="hmstart.gif";
}

function selectWord()
{
	can_play = true;
	random_number = Math.round(Math.random() * (words.length - 1));
	to_guess = words[random_number];
	//document.game.theWord.value = to_guess;
		
	// display masked word
	masked_word = createMask(to_guess);
	document.game.displayWord.value = masked_word;
	display_word = masked_word;
}

function createMask(m)
{
	mask = "";
	word_lenght = m.length;

	for (i = 0; i < word_lenght; i ++)
	{
		mask += "*";
	}
	return mask;
}

window.onload = reset;