function navigate(id)
{
	var type = document.getElementById(id);
	var url = location.href;
	url = url.replace(/&page=([\S])+/g,"");
	url = url.replace(/&per_page=([\S])+/g,"");	
	url = url.replace(/&columns([\S])+/g,"");

	if (id == 'per_page')
		top.location.href = url + "&page=1&per_page="+type.value;
	if (id == 'number_of_columns')
		top.location.href = url + "&page=1&columns="+type.value;
	if (id == 'sort')
		top.location.href = url + "&page=1&sort="+type.value;
}