【select】
<html>
<head>
<script language="JavaScript">
function checkField(formName) {
if (formName.f1.value != "Joe") {
document.forms[0].f1.focus();
document.forms[0].f1.select();
}
}
</script>
</head>
<body>
<form>
Field1 <input name="f1" onBlur="checkField(this.form)"><br>
Field2 <input name="f2">
</form>
</body>
</html>
