function selectAktivita(ide) {
   
   var imgId = "act"+ide;
   var formId = "aktivita"+ide;
   
   if(document.getElementById(imgId)){      
      if(document.forms[0][formId].value > 0) {
         document.getElementById(imgId).style.border = "2px solid #fff2d5";
         document.forms[0][formId].value = '0';
		} else {
	    document.getElementById(imgId).style.border = "2px solid #000000";
	    document.forms[0][formId].value = ide;
   }
  }
}

function resetAktivita() {
  var imgId;
  var formId;
  for (var ide=1;ide<=20;ide++) {
    imgId = "act"+ide;
    formId = "a"+ide;
    document.getElementById(imgId).style.border = "2px solid #fff2d5";
    document.forms[0][formId].value = '0';
  }
}