#mistake {
    background-image: url(overlay.png);
    position: absolute;
    margin: auto;
    top:  0;
    left: 0;
    z-index: 1000;
    width:  100%;
}

* html #mistake {
    background-image: none;
}

#m_window {
    position: absolute;
    background: #fff;
    border: 5px solid #aaa;
    border-radius:10px;
    overflow: auto;
    width: 350px;
    height: 250px;
    z-index: 150;
}

/*
* html #m_window {
  left: 50%;
  margin-left: -175px;
}
*/

#m_frame {
    border: 0;
    overflow: auto;
    width: 100%;
    height: 230px;
}

* html #m_frame {
    margin-top: 7px;
}