/*!
 *  Echo v1.4.0
 *  Lazy-loading with data-* attributes, offsets and throttle options
 *  Project: https://github.com/toddmotto/echo
 *  by Todd Motto: http://toddmotto.com
 *  Copyright. MIT licensed.
 */
window.Echo=function(a,b){"use strict";var c,d,e,f=[],g=function(d){var e=d.getBoundingClientRect();return(e.top>=0&&e.left>=0&&e.top)<=(a.innerHeight||b.documentElement.clientHeight)+parseInt(c)},h=function(){for(var a=f.length;a--;){var b=f[a];g(b)&&(b.src=b.getAttribute("data-echo"),f.splice(a,1))}},i=function(){clearTimeout(e),e=setTimeout(h,d)},j=function(e){var g=b.querySelectorAll("[data-echo]"),h=e||{};c=h.offset||0,d=h.throttle||250;for(var j=0;j<g.length;j++)f.push(g[j]);b.addEventListener?a.addEventListener("scroll",i,!1):a.attachEvent("onscroll",i)};return{init:j,render:i}}(window,document);