<html>
<head>
<script type="text/javascript">
var foco='';
</script>
</head>
<body>
<input type="text" id="txt1" onfocus = "foco=this.id" />
<input type="text" id="txt2" onfocus = "foco=this.id" />
<input type="button" onclick="alert(foco)" />
</body>
</html>
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