function addEvent(obj, evType, fn){
    if (obj.addEventListener){
        obj.addEventListener(evType, fn, false);
        return true;
    } else if (obj.attachEvent){
        var r = obj.attachEvent("on"+evType, fn);
        return r;
    } else {
        return false;
    }
}
function submitOnEnter(evt) {
    if(!evt) evt = event;
    if(evt.keyCode == 13) {
        var eventSrc = null;
        if(!evt.target)
            eventSrc = evt.srcElement;
        else
            eventSrc = evt.target;

        var formElement = document.getElementById(buttonId);
        if(formElement != null) formElement.click();
    }
}