// JavaScript Document
 var zmenaradar = new Array('radar1', 'radar2', 'radar3', 'radar4', 'radar5', 'radar6');

        function prepniradar(id) {
          for (var i=0; i<zmenaradar.length; i++) {
            document.getElementById(zmenaradar[i]).style.display = (zmenaradar[i] == id ? 'block' : 'none');
          }
          return false;
        }