function resetDiv(element) {
   var allElems = document.getElementsByTagName('div');
   for (var i = 0; i < allElems.length; i++) {
    var thisElem = allElems[i];
    if (thisElem.className == 'items') {
     if (thisElem.id != element) {
      thisElem.style.display = 'none';
     }
    }
   }
  }
  
  function toggleDiv(element) {
   if(document.getElementById(element).style.display == 'none')
    document.getElementById(element).style.display = 'block';
  }