var qi = location.href.lastIndexOf("?");
if (qi != - 1 ) {
  var requestString = location.href.substring(qi +  1 );
  var pairs = requestString.split("&");
  for (var i =  0 ; i < pairs.length; i++) {
    var pair = pairs[i];
    var a = pair.split("=");
    var paramName = a[ 0 ];
    var paramValue = a.length >  1  ? a[ 1 ] : "";

    // ...
  }
}