<html>
<head>
<title>Sample</title>
<script Language="Javascript">
<!--
function func(){
document.getElementById("T2").focus();
}
// -->
</script>
</head>
<body>
<input type="text" id="T1">
<input type="text" id="T2">
<input type="button" value="ボタン" onClick="func();">
</body></html>