/* ----- Menu Follow -----*/
#bt_toTop {
	position: fixed; /*กรณี มีค่า top ใช้ absolute  / กรณีเมนูชิดบน ใช้ fixed*/
	background-image: url(../image/concept/top.png);
	background-repeat: no-repeat;
	background-position: center top;
	width: 101px;
	height: 99px;
	z-index: 4;
	right: 10px;
	bottom: -100px;
	opacity: 0;
}
#overlay {   
    position: absolute;  
    top: 0px;   
    left: 0px;  
    background: #ccc;   
    width: 100%;   
    height: 100%;   
    opacity: .75;   
    filter: alpha(opacity=75);   
    -moz-opacity: .75;  
    z-index: 999;  
    background: #fff url(http://i.imgur.com/KUJoe.gif) 50% 50% no-repeat;
}
.main-contain{
    position: absolute;  
    top: 0px;   
    left: 0px;  
    width: 100%;   
    height: 100%;   
    overflow: hidden;
}