getrequestargs in javascript

Here's how to parse the query string (from a method="GET" form) in javascript, returns an object/map

Doesn't handle multiple values (e.g. form?foo=yes&foo=no)

I'm pissed that "hello".replace("l", "w") == "hewlo"
Also pissed that decode("hello+world") != "hello world"

function getrequestargs(url) {
  var args = new Object();
  url = String(url);
  var idx = url.indexOf("?");
  if (idx >= 0) {
    var s = url.substring(idx + 1);
    var pairs = s.split("&");
    for (var i = 0; i < pairs.length; i++) {
      var idx = pairs[i].indexOf("=");
      if (idx > 0) {
        pairs[i] = pairs[i].replace(/\+/g, " ");
        var key = decodeURI(pairs[i].substring(0, idx));
        var value = decodeURI(pairs[i].substring(idx + 1));
        args[key] = value;
      }
    }
  }
  return args;
}

var args = getrequestargs(location);