function highlight(region){
 var mapa;
 mapa = document.getElementById('mapa');
 
 switch(region){
   
   case('jihocesky'):  mapa.style.backgroundPosition = '0 -170px'; break;
   case('plzensky'):  mapa.style.backgroundPosition = '0 -340px'; break;
   case('karlovarsky'):  mapa.style.backgroundPosition = '0 -510px'; break;
   case('ustecky'):  mapa.style.backgroundPosition = '0 -680px'; break;
   case('liberecky'):  mapa.style.backgroundPosition = '0 -850px'; break;
   case('praha'):  mapa.style.backgroundPosition = '0 -1020px'; break;
   case('stredocesky'):  mapa.style.backgroundPosition = '0 -1190px'; break;
   case('kralovehradecky'):  mapa.style.backgroundPosition = '300px 0px'; break;
   case('vysocina'):  mapa.style.backgroundPosition = '300px -170px'; break;
   case('pardubicky'):  mapa.style.backgroundPosition = '300px -340px'; break;
   case('moravskoslezsky'):  mapa.style.backgroundPosition = '300px -510px'; break;
   case('olomoucky'):  mapa.style.backgroundPosition = '300px -680px'; break;
   case('zlinsky'):  mapa.style.backgroundPosition = '300px -850px'; break;
   case('jihomoravsky'):  mapa.style.backgroundPosition = '300px -1020px'; break;
  
   case('none'):  mapa.style.backgroundPosition = '0 0'; break;
 }
 
}