function narrow_search_by_brand(myBrand) {
	var form=document.getElementById('form-filter');
	form.Brand.value=myBrand;
	form.submit();
}
function narrow_search_by_cat(myCat) {
	var form=document.getElementById('form-filter');
	form.SubCatID.value=myCat;
	form.submit();
}
function narrow_search_by_price(myPriceFrom, myPriceTo) {
	var form=document.getElementById('form-filter');
	form.price_from.value=myPriceFrom;
	form.price_to.value=myPriceTo;
	form.submit();
}
function narrow_search_free_shipping(chk) {
	var form=document.getElementById('form-filter');
	if (chk.checked==true) {
		form.free_shipping.value='yes';
	}
	else {
		form.free_shipping.value='';
	}
	form.submit();
}