.teach {
width: 150px;
height: 73px;
background: url("pictures/bears1.gif") no-repeat;
display: inline-block;
}
.teach:hover {
background: url("pictures/bears2.gif") no-repeat;
}
.res {
width: 153px;
height: 73px;
background: url("pictures/research1.gif") no-repeat;
display: inline-block;
}
.res:hover {
background: url("pictures/research2.gif") no-repeat;
}
.prof {
width: 90px;
height: 129px;
background: url("pictures/owl1.gif") no-repeat;
display: inline-block;
}
.prof:hover {
background: url("pictures/owl2.gif") no-repeat;
}
.int {
width: 130px;
height: 89px;
background: url("pictures/flight1.gif") no-repeat;
display: inline-block;
}
.int:hover {
background: url("pictures/flight2.gif") no-repeat;
}