.panely A.panely_snimace:link, .panely A.panely_snimace:visited{ background-image: url(obr/panely_snimace.png); }
 .panely A.panely_snimace:hover, .panely A.panely_snimace:active{ background-image: url(obr/panely_snimace_over.png); }

 .panely A.panely_vazni_systemy:link, .panely A.panely_vazni_systemy:visited{ background-image: url(obr/panely_vazni_systemy.png); }
 .panely A.panely_vazni_systemy:hover, .panely A.panely_vazni_systemy:active{ background-image: url(obr/panely_vazni_systemy_over.png); }