function hasAnchor(anchor) {
  if(window.location.href.include(anchor)) {
    Effect.ScrollTo("product_page_tabs");
    return true;
  }
  return false;
}

document.observe('dom:loaded',function(){
  localized_image = "/images/v4/tabs_sprite_" + current_language + ".png"
  $("product_page_tabs").style.background="url(" + localized_image + ") no-repeat 0 0";
  
  new Control.Tabs('product_page_tabs');

  Control.Tabs.observe("afterChange", function(tab) {
    tab.activeContainer.fire('tab:open');
    $("product_page_tabs").style.background="url(" + localized_image + ") no-repeat 0 "+ tab.activeContainer.getAttribute("data-y-offset");
  });

  /*select tab from anchor url*/
  if(hasAnchor("#article_description")) {
    $("product_page_tabs").style.background="url(" + localized_image + ") no-repeat 0 0";
  } else if(hasAnchor("#payment")) {             
    $("product_page_tabs").style.background="url(" + localized_image + ") no-repeat 0 -38px";      
  } else if(hasAnchor("#terms")) {               
    $("product_page_tabs").style.background="url(" + localized_image + ") no-repeat 0 -76px";        
  }
});