var nn6=document.getElementById&&!document.all;

var time = 0;
var start_time = 0;
var game_over = 0;
var light = 0;
var num_right = 0;

function game_over_reset()
{
document.getElementById("gameover").style.display = "block";
document.getElementById("squarecolor").style.display = "none";
setstatus("0/25");
game_over = 1;
}

function start_game()
{
document.getElementById("gameover").style.display = "none";
document.getElementById("gamesuccess").style.display = "none";
document.getElementById("startbutton").style.display = "none";
document.getElementById("squarecolor").style.display = "block";
game_over = 0;
num_right = 0;
setTimeout("inc_time()",100);
setstatus("0/25");

gen_square();

st = new Date();
start_time = st.getTime();
}

function inc_time()
{
st = new Date();
time = st.getTime() - start_time;

time /= 1000;
time = time.toFixed(1);

settimer("Time: " + time);

if (game_over == 0)
	setTimeout("inc_time()",100);
}

function gen_square()
{
var col = Math.floor(Math.random()*8);
var row = Math.floor(Math.random()*8) + 1; 

var spot = ((row-1) * 8) + col;


if (((row-1) % 2) == 0)
	light = spot % 2;
else
	light = 1 - (spot % 2);

col = String.fromCharCode(col + 97);


setsquare(col + row);
}

function click_light()
{
if (light == 1)
	next_square();
else
	game_over_reset();
}

function click_dark()
{
if (light == 0)
	next_square();
else
	game_over_reset();
}

function next_square()
{
num_right++;
if (num_right == 25)
	{
	winner();
	return;
	}
setstatus(num_right + "/25");
gen_square();
}

function winner()
{
game_over = 1;
document.getElementById("squarecolor").style.display = "none";
document.getElementById("gamesuccess").style.display = "block";
st = new Date();
time = st.getTime() - start_time;
time = Math.round(time/10)/100;
setfinaltime("Final Time: " + time);
document.getElementById("ft").value = time;
document.getElementById("fc").value = gc(time);
}

function setfinaltime(text)
{
nn6 ? document.getElementById("finaltime").innerHTML = text : document.all.finaltime.innerHTML = text;
}


function settimer(text)
{
nn6 ? document.getElementById("statustimer").innerHTML = text : document.all.statustimer.innerHTML = text;
}

function setstatus(text)
{
nn6 ? document.getElementById("status").innerHTML = text : document.all.status.innerHTML = text;
}

function setsquare(text)
{
text = "Square: " + text;
nn6 ? document.getElementById("squareid").innerHTML = text : document.all.squareid.innerHTML = text;
}

function gc(t)
{
return calc(t);
}