Get Url Parameter In JavaScript

function getParameterByName(name)
{
    name = name.replace(/[\[]/, "\\[")
        .replace(/[\]]/, "\\]");
    var regex = new RegExp("[\\?&]" + name + "=([^&#]*)"),
        results = regex.exec(location.search);
    return results === null ? "" : decodeURIComponent(results[1].replace(/\+/g, " "));
}