[рони]

gorbuz9kin,

<li><a href="#"  data-img="img/flag_english_active.png">English</a></li>

if(elem.tagName == 'A') {
            titleElem.innerHTML = elem.textContent;
            var url = elem.dataset.img;
            titleElem.style.backgroundImage = 'url('+url+')'
          }