.img_key_center {
	position:absolute;
	top:0px;
	left:0px;
	height:500px;
	width:500px;
	z-index:499;
	-webkit-transition: all .2s;
	-moz-transition: all .2s;
	-ms-transition: all .2s;
	-o-transition: all .2s;
	transition: all .2s;
}
.img_text_center {
	position:absolute;
	top:0px;
	left:0px;
	height:500px;
	width:500px;
	z-index:498;
	opacity:0;
	-webkit-transition: all .2s;
	-moz-transition: all .2s;
	-ms-transition: all .2s;
	-o-transition: all .2s;
	transition: all .2s;
}