function categories(key){window.location="index.php?action=lista_oferte&cat_id="+key;}
function show_sub(elem){if($(elem).style.display=="none")
{$(elem).style.display="block";$(elem).up().down().className+="_open";}
else
{$(elem).style.display="none";$(elem).up().down().className=$(elem).up().down().className.replace("_open","");}}