Get the last item in an array in Javascript

Here is my JavaScript code so far:

var linkElement = document.getElementById("BackButton");
var loc_array = document.location.href.split('/');
var newT = document.createTextNode(unescape(capWords(loc_array[loc_array.length-2]))); 

Currently it takes the second to last item in the array from the URL. However I want to do a check for the last item in the array to be "index.html" and if so, grab the third to last item instead.