.exhibition_button1 a {

display:block;
height:40px;
width: 40px;

position: relative;
top:15px;
left:185px;

background-image: url(required_images/ex/ex_1_rollover.jpg);
background-repeat: no-repeat;


border-width: 1px;
border-style: solid;
border-color: #000000;

float: left;

}


.exhibition_button1 a:hover { 
background-image:url(required_images/ex/ex_1_rollover.jpg);
background-position: -40px 0px;
}

.exhibition_button1 a:active {
background-image:url(required_images/ex/ex_1_rollover.jpg);
background-position: -40px 0px;
}






.exhibition_button2 a {

display:block;
height:40px;
width: 40px;

position: relative;
top:15px;
left:193px;

background-image: url(required_images/ex/ex_2_rollover.JPG);
background-repeat: no-repeat;


border-width: 1px;
border-style: solid;
border-color: #000000;

float: left;

}


.exhibition_button2 a:hover { 
background-image:url(required_images/ex/ex_2_rollover.JPG);
background-position: -40px 0px;
}

.exhibition_button2 a:active {
background-image:url(required_images/ex/ex_2_rollover.JPG);
background-position: -40px 0px;
}