#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;overflow:auto;width:600px;height:520px;z-index:150}#m_frame{border:0;width:100%;height:auto;min-height:100%;vertical-align:top}* html #m_frame{margin-top:7px}