function orderByColumn(url, aId, orderBy, orderByPrev, direction)
{
	vars=window.location.href.split("?")[1];
	vars=vars.replace(/&?aID=[^&]*/,"");
	vars=vars.replace(/&?orderBy=[^&]*/,"");
	vars=vars.replace(/&?orderByPrev=[^&]*/,"");
	vars=vars.replace(/&?direction=[^&]*/,"");
    url = url + "?" + vars + "&aID="+ aId +"&orderBy="+ orderBy  + "&orderByPrev="+ orderByPrev + "&direction=" + direction;
    url = url.replace(/\?&/, "?");
	window.open (url, "_top");
}