Trigger jQuery UI Autocomplete with Javascript. Good for Selenium

gistfile1.js

function fireEvent(element,event){
    if (document.createEventObject){
        // dispatch for IE
        var evt = document.createEventObject();
        return element.fireEvent('on'+event,evt)
    }
    else{
        // dispatch for firefox + others
        var evt = document.createEvent("HTMLEvents");
        evt.initEvent(event, true, true ); // event type,bubbling,cancelable
        return !element.dispatchEvent(evt);
    }
}

obj = window.document.getElementById("Servicearea");
obj.value = "eu";
fireEvent(obj,"keydown");