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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<form name="frm">
<label for="age">Please Enter Your Number</label>
<input type="text" name="age" id="age" onblur="validate(this.value)" />
<input type="submit" id="Enter" />
</form>
<script language="javascript">
function validate(val) {
if(isNaN(val)) {
alert("XXX XXX XXX");
document.getElementById("age").focus();
}
}
</script>
</body>
</html>
function validate(val) {
if(isNaN(val)) {
alert("XXX XXX XXX");
setTimeout(function () {
document.getElementById("age").focus();
}, 500);
}
}