// JavaScript Document

    window.onload = modifyform;     

    function modifyform() {
      var sel = document.forms[0].adresa_nemovitost;
      var adresa_nemovitost = sel.options[sel.selectedIndex].value;     

      var visible;
      if(navigator.appName == 'Microsoft Internet Explorer') { /* jen pro IE */
        visible = 'block';
      }
      else { /* ostatni prohlizece */
        visible = 'block';
      }     

      if(adresa_nemovitost == 'ANO') {
        document.getElementById('zavrene').style.display = 'none';

      }
      else if(adresa_nemovitost == 'NE') {
        document.getElementById('zavrene').style.display = visible;

      }
    }