.ajax_content_loading {
  /* FILL DIV */
  min-height:100%;  
  background-color:#E3E3E3;
  opacity:0.2;
  filter:alpha(opacity=20); 
}

#tbf_ajax_content_loading {
  display:none;
  position:absolute;
  width:50%;
  z-index:1000;
  padding-top:150px;
  text-align:center;
}