function bn_getCookie(c_name) {
	if (document.cookie.length <= 0) return;
	var c_start = document.cookie.indexOf(c_name + "=");
	if (c_start == -1) return;
	c_start = c_start + c_name.length+1;
	var c_end = document.cookie.indexOf(";",c_start);
	if (c_end == -1) c_end = document.cookie.length;
	return unescape(document.cookie.substring(c_start,c_end));
}
function bnsearch_submit(bnsearch_form) {
	if(!bnsearch_form) return;
	var bn_u_val = bn_getCookie('bn_u');
	if (!bn_u_val) return;
	bnsearch_form.elements['bn_u'].value = bn_u_val;
}