function filterbyOffer(offer_id)
{
	document.getElementById("brand_id_filter").value = '';
	document.getElementById("offer_type").value = offer_id;
	document.listing_form.submit();
}
function filterbyBrand(brand_id)
{
	document.getElementById("brand_id_filter").value = brand_id;
	document.getElementById("offer_type").value ='';
	document.listing_form.submit();
}