div#msgbox_boxfond{
  display:block;
  position : absolute;
  top:0;
  left:0;  
  width: 100%;  /*Occupe tout l'écran*/
  height : 100%;
  background-color:#E6E6FA;   /* couleur de fond */
  z-index: 10;  
  filter : alpha(opacity=50); /*Opacité pour IE*/
  opacity : 0.5;  /*OPacité pour els autres */
}
div#msgbox_boxmess{
  display:block;
  position : absolute;
  width: 25%;
  top:35%;
  left:35%;
  background-color:#FFFFFF;
  opacity: 1;
  z-index: 11;  
  border-style : ridge;
  border-color:  #B0C4DE;  
  text-align: center;
  padding: 3px;
  background-color:#C8FFFF;
  border-width: 5px;
}
div#msgbox_txttitle{  
  position : relative;
  width:100%;
  height :10%;
  margin-left:  auto;
  margin-right: auto;  
  margin-bottom: 10px;
  background-color:#98FB98;
  border-style : solid;
  border-width: 1px;
}
div#msgbox_txtmess{  
  position : relative;
  width:90%;
  height :10%;
  margin-left:  auto;
  margin-right: auto;  
}
.msgbox_btn{
  position : relative;
  display:block;  
  margin-top: 5%;
  width:25%;   
  margin-left:  auto;
  margin-right: auto;
}