Hi i have found this nice javascript puzzle game

Code:
<!doctype html>
<html>
<head>
 <title>Sliding Puzzle</title>
 <style type="text/css">
 .picture {
   border: 1px solid black;
 }
body{

width:100%; 
height:100%; 
margin:0; 
padding:0; 
overflow:hidden; 
/* Disable tap overlay color on links - set alpha to %0 = invisible */ 
-webkit-tap-highlight-color: rgba(0, 0, 0, 0); 
font-family: sans-serif;
background-color: #13407a;
color: #B9780F;
}
 </style>
<meta content="text/html; charset=UTF-8" http-equiv="Content-Type" /> 
<meta content="width=device-width, initial-scale=1.0" name="viewport" /> 
</head>
<body>
<center>
   <form>
     <input type="hidden" id="scale" value="4">
   </form>
   <br>
 <div id="main" class="main">
   <canvas id="puzzle" width="300px" height="300px"></canvas>
 </div>
 <script>
 var context = document.getElementById('puzzle').getContext('2d');

var img = new Image();
img.src = 'http://apps.marianasgps.com/ev1/duanepahl/puzzle.jpg';
img.addEventListener('load', drawTiles, false);

var boardSize = document.getElementById('puzzle').width;
var tileCount = document.getElementById('scale').value;

var tileSize = boardSize / tileCount;

var clickLoc = new Object;
clickLoc.x = 0;
clickLoc.y = 0;

var emptyLoc = new Object;
emptyLoc.x = 0;
emptyLoc.y = 0;

var solved = false;

var boardParts = new Object;
setBoard();

document.getElementById('scale').onchange = function() {
 tileCount = this.value;
 tileSize = boardSize / tileCount;
 setBoard();
 drawTiles();
};

document.getElementById('puzzle').onmousemove = function(e) {
 clickLoc.x = Math.floor((e.pageX - this.offsetLeft) / tileSize);
 clickLoc.y = Math.floor((e.pageY - this.offsetTop) / tileSize);
};

document.getElementById('puzzle').onclick = function() {
 if (distance(clickLoc.x, clickLoc.y, emptyLoc.x, emptyLoc.y) == 1) {
   slideTile(emptyLoc, clickLoc);
   drawTiles();
 }
 if (solved) {
   setTimeout(function() {alert("You solved it!");}, 500);
 }
};

function setBoard() {
 boardParts = new Array(tileCount);
 for (var i = 0; i < tileCount; ++i) {
   boardParts[i] = new Array(tileCount);
   for (var j = 0; j < tileCount; ++j) {
     boardParts[i][j] = new Object;
     boardParts[i][j].x = (tileCount - 1) - i;
     boardParts[i][j].y = (tileCount - 1) - j;
   }
 }
 emptyLoc.x = boardParts[tileCount - 1][tileCount - 1].x;
 emptyLoc.y = boardParts[tileCount - 1][tileCount - 1].y;
 solved = false;
}

function drawTiles() {
 context.clearRect ( 0 , 0 , boardSize , boardSize );
 for (var i = 0; i < tileCount; ++i) {
   for (var j = 0; j < tileCount; ++j) {
     var x = boardParts[i][j].x;
     var y = boardParts[i][j].y;
     if(i != emptyLoc.x || j != emptyLoc.y || solved == true) {
       context.drawImage(img, x * tileSize, y * tileSize, tileSize, tileSize,
           i * tileSize, j * tileSize, tileSize, tileSize);
     }
   }
 }
}

function distance(x1, y1, x2, y2) {
 return Math.abs(x1 - x2) + Math.abs(y1 - y2);
}

function slideTile(toLoc, fromLoc) {
 if (!solved) {
   boardParts[toLoc.x][toLoc.y].x = boardParts[fromLoc.x][fromLoc.y].x;
   boardParts[toLoc.x][toLoc.y].y = boardParts[fromLoc.x][fromLoc.y].y;
   boardParts[fromLoc.x][fromLoc.y].x = tileCount - 1;
   boardParts[fromLoc.x][fromLoc.y].y = tileCount - 1;
   toLoc.x = fromLoc.x;
   toLoc.y = fromLoc.y;
   checkSolved();
 }
}

function checkSolved() {
 var flag = true;
 for (var i = 0; i < tileCount; ++i) {
   for (var j = 0; j < tileCount; ++j) {
     if (boardParts[i][j].x != i || boardParts[i][j].y != j) {
       flag = false;
     }
   }
 }
 solved = flag;
}
 </script>
 </center>
</body>
</html>
it works fine in browsers but i wanted to add it to my Android smartphone

there it works but every time you press to move a block (it move it) instead showing a black (or any background has the html) empty block to the one that moved.. showing the image of the block as it was before..

so now having 2 same blocks even one is ''empty'' and that make it little difficult to play


http://i30.photobucket.com/albums/c3...ps7d9f3e12.jpg

maybe i am asking to much but i have not so many knowledge in coding .. sorry

thanks in advance