function change_num_results(select_el)
{
	num = select_el[select_el.selectedIndex].value;
	if(num != '')
	{
		location='?results_per_page='+num;
	}
}
function filter_results(select_el)
{
	filter_id = select_el[select_el.selectedIndex].value;
	if(filter_id != '')
	{
		location='?filter='+filter_id;
	}
}