在画布标签里放一张照片

我正试图在html5中创建一个photoslider，然后将其放入画布标记中。到目前为止，我可以看到这些图像，但我无法将画布设置在它们后面。有人能告诉我发生了什么事吗？提前谢谢。

HTML:

<html>
<head>
    <script type="text/javascript">
        var step = 1;
        var img = new Array(17);
        for(var i = 1; i <= 17; i++){
            img[i] = new Image();
            img[i].src = "/images/img"+i+".jpg";    //load images
        }
    </script>
    <script type="text/javascript" src="jsphotoSliderController.js"></script>
</head>
<body>
<section id="photoSliderContainer">
        <img name="slide" id="photoSliderControls" src="C:UsersVassileiosDropboxsymmetexwimagesimg1.jpg" width="500" height="300"> 
            <script type="text/javascript">
                slideImages();
            </script>
        </img>
        <canvas id="photoSliderViewport">
            Your browser does not support the HTML5 canvas tag.
        </canvas>
    </section>
</body>
</html>

CSS：

#photoSliderViewPort{
float: right;
margin-top: 3%;
margin-right: 0%;
margin-bottom: 95%;
margin-left: 24%;
width: 800px;
height: 800px;
background:rgba(75,75,186,1);
}
#photoSliderControls{
float: right;
margin-top: 3%;
margin-right: 0%;
margin-bottom: 95%;
margin-left: 24%;
z-index:1;
}

JS:

function slideImages(){
document.images.slide.src = eval("img["+step+"].src");
    if(step<17)
        step++;
    else
        step=1;
setTimeout("slideImages()",3000);
}

var canvas = document.getElementById('photoSliderViewport');
var ctx = canvas.getContext('2d');
var step = 0; // Start Array key (0 indexed)
var images = []; // Array of image paths
var nOfImages = 5; // Set here the desired number of images
canvas.width = 800;
canvas.height = 800;
// Populate array with paths;
for(var i=1; i<=nOfImages; i++){
  images.push("http://placehold.it/800x800/ccc&text="+i+".jpg");
}
console.log(images);
function slideImages(){
  var img = new Image();
  img.onload = function(){         // Once it's loaded...
    ctx.drawImage(img, 0, 0);      // Draw it to canvas
    step = ++step % nOfImages ;    // Increase and loop step
    setTimeout(slideImages, 3000); // Do it again in 3000ms
  };
  img.src = images[step];          // Finally, set the new image src
}
slideImages(); // START

    <section id="photoSliderContainer">
      <canvas id="photoSliderViewport">
        Your browser does not support the HTML5 canvas tag.
      </canvas>
    </section>

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