JavaScript 文本框变成密码框

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE>Test</TITLE>
<script type="text/javascript">
function show(obj)
{
	if(obj.type=="text")
	{
		obj.style.display = "none";
		document.getElementById('pass').style.display = "block";
		document.getElementById('pass').value="";
		document.getElementById('pass').focus();
	}
	else
	{
		var pass = document.getElementById('pass').value;
		if(pass.length<1)
		{
			obj.style.display = "none";
			document.getElementById('txt').style.display = "block";
		}
	}
}
</script>
</HEAD>
<BODY>
	<input >
	<input >
</BODY>
</HTML>

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