How to remove/change JQuery UI Autocomplete Helper text?

This is used for accessibility, an easy way to hide it is with CSS:

.ui-helper-hidden-accessible { display:none; }

Or (see Daniel's comment bellow)

.ui-helper-hidden-accessible { position: absolute; left:-999em; }

I know this has been asnwered but just wanted to give an implementation example:

var availableTags = [
      "ActionScript",
      "AppleScript",
      "Asp",
      "BASIC",
      "C",
      "C++"
    ];

$("#find-subj").autocomplete({
    source: availableTags,
    messages: {
        noResults: 'no results',
        results: function(amount) {
            return amount + 'results.'
        }
    }
});

The top answer here achieves the desired visual effect, but defeats the object of jQuery having ARIA support, and is a bit dickish to users who rely upon it! Those who've mentioned that jQuery CSS hides this for you are correct, and this is the style which does that:

.ui-helper-hidden-accessible {
    border: 0;
    clip: rect(0 0 0 0);
    height: 1px;
    margin: -1px;
    overflow: hidden;
    padding: 0;
    position: absolute;
    width: 1px;
}

Copy that into your stylesheet instead of removing the message, please :).