Cómo obtener parámetros de URL mediante javascript

function getUrlParam(name) {
   var regexS = "[\\?&]" + name + "=([^&#]*)";
   var regex = new RegExp(regexS);
   var tmpURL = window.location.href;
   var results = regex.exec(tmpURL);
   if (results == null)
       return "";
   else
       return results[1];
}