#knoppen {
position:relative;
top:10px;
}
a#knop-blackberry {
width: 188px;
height: 45px;
display: block;
background: url(../img/knop/BlackBerry.jpg) no-repeat;
}
a#knop-nokian97 {
width: 188px;
height: 45px;
display: block;
background: url(../img/knop/nokian97.jpg) no-repeat;
}
a#knop-compaq160 {
width: 188px;
height: 45px;
display: block;
background: url(../img/knop/nokialaptop.jpg) no-repeat;
}
a#knop-samsungdiva {
width: 188px;
height: 45px;
display: block;
background: url(../img/knop/samsungdiva.jpg) no-repeat;
}

a:hover#knop-blackberry, a:hover#knop-nokian97, a:hover#knop-compaq160, a:hover#knop-samsungdiva {
background-position:0px -45px;
}