JavaScript get GET variables

gistfile1.js

function getQueryVariable(variable)
{
       var query = window.location.search.substring(1);
       var vars = query.split("&");
       for (var i=0;i<vars.length;i++) {
               var pair = vars[i].split("=");
               if(pair[0] == variable){return pair[1];}
       }
       return(false);
}

// OR 

Requests = {
  QueryString : function(item){
  var svalue = location.search.match(new RegExp(“[\?\&]” + item + “=([^\&]*)(\&?)”,”i”));
  return svalue ? svalue[1] : svalue;
  }
}

//usage
Requests.QueryString(“id”);