var myURL = "http://www.site.com/example/index.html";
var myDir = myURL.substring( 0, myURL.lastIndexOf( "/" ) + 1);

var s1 = "http://www.site.com/example/index.html";
var s2 = s1.replace(s1.split("/").pop(),"");

var a = "http://www.site.com/example/index.html";
var b = a.substring(0, a.lastIndexOf('/'))+"/";

var url = "http://www.site.com/example/index.html";
var newUrl = url.match(/^(.*[\/])/)[1];

$(location).prop("href").split("/").slice(0,-1).join("/")