把option從一個select挪到另外一個select

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>MoveOptions.html</title>
	
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="this is my page">
    <meta http-equiv="content-type" content="text/html; charset=UTF-8">
    
    <!--<link rel="stylesheet" type="text/css" href="./styles.css">-->
	<script type="text/javascript">
		function $(id){
			return document.getElementById(id);
		}
		function moveSelect(src,dest){
			var src = $(src);
			var dest = $(dest);
			var options = src.options;
				for(var i=options.length-1; i>=0; i--){
				if(options[i].selected){
					dest.appendChild(options[i]);
				}
			}
		}
	</script>

  </head>
  
  <body style="text-align: center" >
    <select id="left" multiple="multiple" style="width: 200px;height: 200px">
    	<option>火德星君</option>
    	<option>鎮河天將</option>
    	<option>定海神將</option>
    	<option>鎮嶽天將</option>
    </select>
    <input type="button" value=">>>>" onclick="moveSelect('left','right');" />
    <input type='button' value='<<<<' onclick="moveSelect('right','left');" />
    <select id="right" multiple="multiple"  style="width: 200px;height: 200px">
    	<option>火德星君XX</option>
    	<option>鎮河天將XX</option>
    	<option>定海神將XX</option>
    	<option>鎮嶽天將XX</option>
    </select>
  </body>
</html>
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