JS数据载入中Loading

<script>
  function loadBar(fl)
  {
  	var x, y;
  	if (self.innerHeight)
  	{
  		x = self.innerWidth;
  		y = self.innerHeight;
  	}
  	else if (document.documentElement && document.documentElement.clientHeight)
  	{
  		x = document.documentElement.clientWidth;
  		y = document.documentElement.clientHeight;
  	}
  	else if (document.body)
  	{
  		x = document.body.clientWidth;
  		y = document.body.clientHeight;
  	}
  	var el = document.getElementById('loader');
  	if (null != el)
  	{
  		var top = (y / 2) - 50;
  		var left = (x / 2) - 150;
  		if (left <= 0) left = 10;
  		el.style.visibility = (fl == 1) ? 'visible' : 'hidden';
  		el.style.display = (fl == 1) ? 'block' : 'none';
  		el.style.left = left + "px"
  		el.style.top = top + "px";
  		el.style.zIndex = 2;
  	}
  }
</script>
<body onload="loadBar(0)">
<div id="loader">
	<table style="FILTER: Alpha(opacity=75);" class="loader" summary="Loader Layout" border="0" cellpadding="5" cellspacing="1" bgcolor="#bbbbb">
	<tr>
		<td bgcolor="#FFFFFF" align="left">
			<p>
				<img src="clocks.gif" height="32" width="32" align="left" style="margin:3px" alt="请等待"/><strong>数据载入中...</strong><br/>
				<span style="font-size:8pt;">Please wait until this screen is completely loaded.</span>
			</p>
		</td>
	</tr>
	</table>
</div>
<script type="text/javascript" language="javascript">loadBar(1)</script>
</body>

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