Default: "default.png"
Default: "" (empty string)
http://demos.e-noise.com/jQuery.suggest/
...
<input name="username" id="username">
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.min.js"></script>
<script src="js/jquery.suggest.js"></script>
<script>
jQuery(document).ready(function ($) {
$('#username').suggest({
search: function (s, cb) {
cb([]);
}
});
});
</script>
...