a#tandems {
    display: block;
	width: 147px;
    height: 240px;
    background-image: url(images/courses-tandems.jpg);
    margin: 0 auto;
}
a#tandems:hover {
    background-image: url(images/courses-tandems-over.jpg);
}
a#beginner {
    display: block;
	width: 141px;
    height: 240px;
    background-image: url(images/courses-beginner.jpg);
    margin: 0 auto;
}
a#beginner:hover {
    background-image: url(images/courses-beginner-over.jpg);
}
a#intermediate {
    display: block;
	width: 142px;
    height: 240px;
    background-image: url(images/courses-intermediate.jpg);
    margin: 0 auto;
}
a#intermediate:hover {
    background-image: url(images/courses-intermediate-over.jpg);
}
a#siv {
    display: block;
	width: 142px;
    height: 240px;
    background-image: url(images/courses-siv.jpg);
    margin: 0 auto;
}
a#siv:hover {
    background-image: url(images/courses-siv-over.jpg);
}
a#xc {
    display: block;
	width: 136px;
    height: 240px;
    background-image: url(images/courses-xc.jpg);
    margin: 0 auto;
}
a#xc:hover {
    background-image: url(images/courses-xc-over.jpg);
}