javascript array traffic light - 


<!doctype html>  <html>  <body>    <img id="h:\it\traffic-light-red.jpg" src="h:\it\traffic-light-red.jpg">    <button type="button" onclick="changelights()">change lights</button>    <script>  var list = [      "h:\it\traffic-light-red.jpg",      "h:\it\traffic-light-red-amber.jpg",      "h:\it\traffic-light-green.jpg",      "h:\it\traffic-light-red.jpg"  ];    var index = 0;    function changelights() {      index = index + 1;        if (index == list.length) index = 0;        var image = document.getelementbyid('light');      image.src=list[index];  }  </script>    </body>  </html>

i not understand why code isn't working. every time try open in browser doesn't show me image. i'm struggling in school , appreciate of point me in right direction.

if put "h:\it\traffic-light-red.jpg" in browser's address bar work? nope! cause it's trying access image on file system. need use file protocol. like: 

<!doctype html> <html> <body>  <img id="h:\it\traffic-light-red.jpg" src="h:\it\traffic-light-red.jpg">  <button type="button" onclick="changelights()">change lights</button>  <script> var list = [     "file:///h:/it/traffic-light-red.jpg.html"     "file:///h:/it/traffic-light-red-amber.jpg",     "file:///h:/it/traffic-light-green.jpg",     "file:///h:/it/traffic-light-red.jpg" ];  var index = 0;  function changelights() {     index = index + 1;      if (index == list.length) index = 0;      var image = document.getelementbyid('light');     image.src=list[index]; } </script>  </body> </html>

if files hosted somewhere on web dropbox grab links , work.


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