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

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

#m_window6 {
  position: absolute;
  background: #fff;
  border: 5px solid #fff;
  overflow: auto;
  width:410px;
  height: 630px;
  z-index: 150;
}

#m_frame6 {
  border: 0; 
  overflow: auto;
  width:100%;
  height: 100%;

}