function switchdisplay(element) {
  element=element.parentNode.firstChild;
  do { element = element.nextSibling; } while (element.nodeName != 'UL')
  if (element.style.display != 'block') { element.style.display = 'block'; document.getElementById('siproducts').className='active'; }
  else { element.style.display = ''; document.getElementById('siproducts').className=''; }
 }