function fireEvent(obj,evt){	
  var fireOnThis = obj;
  if( document.createEvent ) {
    var evObj = document.createEvent('MouseEvents');
    evObj.initEvent( evt, true, true );
    fireOnThis.dispatchEvent(evObj);
  } else if( document.createEventObject ) {
    fireOnThis.fireEvent('on'+evt);
  }
}