.home {
width: 45px; 
height: 67px;
}

.home a {
display: block;
background-image: url(../images/icon_homeBW.gif);
width: 45px;
height: 67px;

}

.home a:hover {
background-image: url(../images/icon_homeCOLOR.gif);
}

.about {
width: 72px; 
height: 67px;
}

.about a {
display: block;
background-image: url(../images/icon_aboutBW.gif);
width: 72px;
height: 67px;

}

.about a:hover {
background-image: url(../images/icon_aboutCOLOR.gif);
}


.news {
width: 46px; 
height: 67px;
}

.news a {
display: block;
background-image: url(../images/icon_newsBW.gif);
width: 46px;
height: 67px;

}

.news a:hover {
background-image: url(../images/icon_newsCOLOR.gif);
}



.teacher {
width: 53px; 
height: 67px;
}

.teacher a {
display: block;
background-image: url(../images/icon_teacherBW.gif);
width: 53px;
height: 67px;

}

.teacher a:hover {
background-image: url(../images/icon_teacherCOLOR.gif);
}


.researcher {
width: 73px; 
height: 67px;
}

.researcher a {
display: block;
background-image: url(../images/icon_researcherBW.gif);
width: 73px;
height: 67px;

}

.researcher a:hover {
background-image: url(../images/icon_researcherCOLOR.gif);
}



.products {
width: 59px; 
height: 67px;
}

.products a {
display: block;
background-image: url(../images/icon_productsBW.gif);
width: 59px;
height: 67px;

}

.products a:hover {
background-image: url(../images/icon_productsCOLOR.gif);
}



.training {
width: 53px; 
height: 67px;
}

.training a {
display: block;
background-image: url(../images/icon_trainingBW.gif);
width: 53px;
height: 67px;

}

.training a:hover {
background-image: url(../images/icon_trainingCOLOR.gif);
}

.contact {
width: 51px; 
height: 67px;
}

.contact a {
display: block;
background-image: url(../images/icon_contactBW.gif);
width: 51px;
height: 67px;

}

.contact a:hover {
background-image: url(../images/icon_contactCOLOR.gif);
}