Focus notice

HTML

<input id="start" type="text" name="start"><span class="notice"></span>

JavaScript

$('#start').focus().on('blur keyup keypress', function () {
    var element = $(this),
        notice = element.next('.notice');
    if(!element.val()) { 
        element.focus();
        notice.text('You Missed a Required Form Field :)'); 
    }
    else {
        notice.text('');
    }
});