Pass params to JavaScript from url

// www.mysite.com/my_app.html?Use_Id=abc

var GET = {};
var query = window.location.search.substring(1).split("&");
for (var i = 0, max = query.length; i < max; i++)
{
if (query[i] === "") // check for trailing & with no param
continue;

var param = query[i].split("=");
GET[decodeURIComponent(param[0])] = decodeURIComponent(param[1] || "");
}