.students, .students a { display: block; }
.students { 
width: 63px; height: 23px; overflow: hidden; 
background-image:url(/assets/btns/students.jpg); 
background-position: -20px -56px ; /* rollover state - horizontal vertical */
}
.students a { width: 100%; padding-top: 23px; height: 0; 
background-image:url(/assets/btns/students.jpg); 
background-position: -20px -16px; /* normal state - horizontal vertical */
}
.students a:hover { background-image: none; } /* reveals the rollover image below it */

.students { display: inline; float: left;   }

.staff, .staff a { display: block; }
.staff { 
width: 63px; height: 23px; overflow: hidden; 
background-image:url(/assets/btns/staff.jpg); 
background-position: -20px -56px ; /* rollover state - horizontal vertical */
}
.staff a { width: 100%; padding-top: 23px; height: 0; 
background-image:url(/assets/btns/staff.jpg); 
background-position: -20px -16px; /* normal state - horizontal vertical */
}
.staff a:hover { background-image: none; } /* reveals the rollover image below it */

.staff { display: inline; float: left;   }