function nav_form_submit(faction) {
  document.tnavform.action=faction;
  document.tnavform.submit()
}

function cng_tm_bg(menu_item, style)
{
  if(style == 1) {
    menu_item.style.backgroundImage='url(images/tm_mb_sel.jpg)';
  } else {
    menu_item.style.backgroundImage='url(images/tm_mb.jpg)';
  }
}

function cng_image(item, image)
{
  item.src=image;
}

function cng_bg_col(item, color)
{
  item.style.backgroundColor=color;
}

function preloadImages()
{
  if(document.images)
  {
    if(!document.imageArray) document.imageArray = new Array();
    var i,j = document.imageArray.length, args = preloadImages.arguments;
    for(i=0; i<args.length; i++)
    {
      if (args[i].indexOf("#")!=0)
      {
        document.imageArray[j] = new Image;
        document.imageArray[j++].src = args[i];
      }
    }
  }
}

function imageChange(name,src) {
  if (document.images) document.images[name].src = src
}

function imageChange(name,src) {
  if (document.images) document.images[name].src = src
}

function Showbranch (oElement) {
  var oElementNode = document.getElementById(oElement);
  if ( oElementNode.style.display == 'none' ) {
    oElementNode.style.display = 'block';
  } else {
    oElementNode.style.display = 'none';
  }
}

function check_categories_selection() {
  for (var i = 0; i <= document.forms.chooser.prtcategory_id.length - 1; i++)
  if (document.forms.chooser.prtcategory_id[i].checked) return true
  alert('Помилка')
  return false
}