function sort(combo, base_url) {
	
	var sort = "";
	var direction = "";
	var search = "";
	
	if (combo.value != "") {
		var parts = combo.value.split("_");
		sort = parts[0];
		direction = parts[1];
	}
	
	if (combo.getAttribute('search') != null) {
		search = "searchstring=" + combo.getAttribute('search') + '&';
	}
	
	document.location.href = base_url.split('?')[0] + '?' +   
		search + 'sort=' + sort + "&direction=" + direction;
}