.popup { 
  position: absolute; 
  z-index: 2; 
} 
.popup_bg { 
  position: absolute;
  visibility: hidden;
  width: 100%; 
  height: 100%;
  filter: alpha(opacity=70); /* for IE */ 
  opacity: 0.7; /* CSS3 standard */
  top: 0px; 
  left: 0px;  
  background-color: #999; 
  z-index: 1; 
} 
.ytcontainer { 
  border: 2px solid #666; 
  clear: both; 
} 
.close_button { 
  font-family: Verdana, Geneva, sans-serif; 
  font-size: small;
  font-weight: bold;  
  color: #666;
  text-decoration: none;  
  display: block;
  float: right;  
  background-color: #FFF; 
  z-index: 3;
  cursor: default;  
  border: 2px solid #666; 
  margin-bottom: -2px; 
  padding: 0px 3px 0px 3px; 
}