.btnindex, .btnbases, .btnsyracuse, .btnmetapost, .btnpstricks {
    width:120px;
    height:30px;
    float:left;
}

.btnindex {
    background-image:url('index.png');
    background-repeat:no-repeat;
}
.btnbases {
    background-image:url('bases.png');
    background-repeat:no-repeat;
}
.btnsyracuse {
    background-image:url('syracuse.png');
    background-repeat:no-repeat;
}
.btnmetapost {
    background-image:url('metapost.png');
    background-repeat:no-repeat;
}
.btnpstricks {
    background-image:url('pstricks.png');
    background-repeat:no-repeat;
}

.btnindex a, .btnbases a, .btnsyracuse a, .btnmetapost a, .btnpstricks a {
    width:120px;
    height:30px;
    margin:0;
    display:block;
}

.btnindex a:hover {
    background-image:url('indexh.png');
}
.btnbases a:hover {
    background-image:url('basesh.png');
}
.btnsyracuse a:hover {
    background-image:url('syracuseh.png');
}
.btnmetapost a:hover {
    background-image:url('metaposth.png');
}
.btnpstricks a:hover {
    background-image:url('pstricksh.png');
}