Build a query string when given the params object

build_query_params.js

url = $.url();
params = url.param();  
if (params.q != null) {
  qs = buildQueryString(params);
}

buildQueryString = function(params) {
  var param, qs;

  qs = '';
  for (param in params) {
    if (qs === '') {
      qs = '?';
    } else {
      qs = qs + '&';
    }
    qs = qs + param + '=' + encodeURIComponent(params[param]);
  }
  return qs;
};