function toggleDiv(divid) {
  if(document.getElementById(divid).style.display == 'none') {
    document.getElementById(divid).style.display = 'block';
    document.images["button_"+divid].src=document.getElementById('ctx').value+"/images/scroll_arrow_up_on.png";
  }
  else {
    document.getElementById(divid).style.display = 'none';
    document.images["button_"+divid].src=document.getElementById('ctx').value+"/images/scroll_arrow_down_on.png";
  }
}