[рони]

strange.tany,

window.addEventListener('DOMContentLoaded', function() {
[].forEach.call(document.querySelectorAll('.close'), function(item) {
        item.addEventListener('click', function(event) {
            item.src = item.id + 'open.png';
        });
    });
});

или

function task(e) {
  var item = e.target;
  item.src = item.id + 'open.png';
}