Get the link behind? Parameter value after question mark

//  function   
function GetRequest2(key)
    {
      var url = location.search;
      var theRequest = new Object();
      if (url.indexOf("?") != -1)
      {
        var str = url.substr(1);
        strs = str.split("&");
        for (var i = 0; i < strs.length; i++)
        {
          theRequest[strs[i].split("=")[0]] = unescape(strs[i].split("=")[1]);
        }
      }
      var value = theRequest[key];
      return value;
    }

//  call 

GetRequest2('namenum');

//  for example    www.xxx.com?namenum=1
//  Output    1