动态的Loading文字,逐个变大

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<html>
<head>
<title>动感Loading文字</title>
<script language="javascript">
<!--
text = "Loading...";
i    = 0;
function flash(){
str = text.charAt(i);
str = "<b>" + str + "</b>";
leftStr  = text.substr(0,i);
rightStr = text.substr(i+1,text.length-i);
txt.innerHTML = leftStr + str + rightStr;
i++;
if (i>=text.length)i=0;
setTimeout("flash()",500);
}
//-->
</script>
</head>
<body onLoad="flash()">
<div id="txt" style="font-size:28px;font-family:Arial">
</div>
</body>
</html>
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