html5写的3D逼真圣诞树效果
	  html, body { width: 100%; height: 100%; margin: 0; padding: 0; border: 0; }
	  div { margin: 0; padding: 0; border: 0; }
	  .nav {
	  position: absolute;
	  top: 0;
	  left: 0;
	  width: 100%;
	  height: 27px;
	  background-color: white;
	  color: black;
	  text-align: center;
	  line-height: 25px;
	  }
	  a { color: black; text-decoration: none; border-bottom: 1px dashed black; }
	  a:hover { border-bottom: 1px solid red; }
	  .previous { float: left; margin-left: 10px; }
	  .next { float: right; margin-right: 10px; }
	  .green { color: green; }
	  .red { color: red; }
	  textarea { width: 100%; height: 100%; border: 0; padding: 0; margin: 0; padding-bottom: 20px; }
	  .block-outer { float: left; width: 22%; height: 100%; padding: 5px; border-left: 1px solid black; margin: 30px 3px 3px 3px; }
	  .block-inner { height: 68%; }
	  .one { border: 0; }
	  var collapsed = true;
	  function toggle() {
	  var fs = top.document.getElementsByTagName('frameset')[0];
	  var f = fs.getElementsByTagName('frame');
	  if (collapsed) {
	  fs.rows = '250px,*';
	  // enable resizing of frames in firefox/opera
	  fs.noResize = false;
	  f[0].noResize = false;
	  f[1].noResize = false;
	  } else {
	  fs.rows = '30px,*';
	  // disable resizing of frames in firefox/opera
	  fs.noResize = true;
	  f[0].noResize = true;
	  f[1].noResize = true;
	  }
	  collapsed = !collapsed;
	  }
	  var b = document.body;
	  var c = document.getElementsByTagName('canvas')[0];
	  var a = c.getContext('2d');
	  document.body.clientWidth; // fix bug in chrome.
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