Obtener parámetros get con javascript

var v = getUrlVars();

var acceso = v[0];

function getUrlVars()

{    

   var vars = [], hash;    

   var hashes = window.location.href.slice(window.location.href.indexOf('?') +1).split('&');            
 
   for(var i = 0; i < hashes.length; i++)
   {
    hash = hashes[i].split('=');
 vars.push(hash[0]);
 vars[hash[0]] = hash[1];

   }

   return vars;