This plugin takes care of hiding your labels and setting them as an input value. Perfect for search forms or short forms without breaking the usability for disabled people, screenreaders and non js-enabled browsers.
If you click the field the text disappears so that you can type your own input. If you leave the field blank and click elsewhere the original content is restored. If content was filled in by your application and it's not the same as your label text. Then it keeps that as a value without disappearing or taking it as a default value.
$(document).ready(function() {
$('selector').clearLabel();
});