.login {
	background-attachment: fixed;
	background-image: url(images/index_17-20.jpg);
	background-repeat: no-repeat;
	background-position: center center;
}
.tab11 {
	background-attachment: fixed;
	background-image: url(images/index_21.jpg);
	background-repeat: no-repeat;
	background-position: center center;
}