#pjncarrows #but1 {background: url(images/arrow_l.png) no-repeat;cursor: pointer;}
#pjncarrows #but2{background: url(images/arrow_r.png) no-repeat;cursor: pointer;}
#pjncarrows #but1:hover {background-position: bottom;}
#pjncarrows #but2:hover {background-position: bottom;}