Same, but nicer, listens to mouseover events on img elements that may not exist yet. Then again, this will - if I understand correctly - cause the event to bubble up in the DOM until it reaches the root element, where jquery's live callback handler will check what element the event took place on and invoke that callback.

    var evt = document.createEvent("MouseEvent");
    evt.initMouseEvent("mouseover", true, true, window,
      0, 0, 0, 0, 0, false, false, false, false, 0, null);

    function isALemming(node) {
      return node.nodeName === 'IMG';
    }
    function fakeMouseover(node) {
      node.dispatchEvent(evt);
    }
    
    function saveLemmings(possibleLemmings) {
      possibleLemmings.filter(isALemming).forEach(fakeMouseover);
    }
    
    var observer = new MutationObserver(function(mutations) {
      mutations.forEach(function(record) {
        saveLemmings(Array.prototype.slice.call(record.addedNodes || []));
      });
    });
    saveLemmings(Array.prototype.slice.call(document.getElementsByTagName('img')));
    observer.observe(document.body, { childList: true });

    var event = document.createEvent("MouseEvent");
    event.initMouseEvent("mouseover", true, true, window);

    function save_them_prontos(){
        var ims = document.getElementsByTagName('img');

        for(var i=0;i<ims.length; i++){
            if(ims[i].id == ''){
               ims[i].id = i;
               ims[i].dispatchEvent(event);
            }
        }
        time_dem();
    }


    function time_dem(){
        window.setTimeout(function(){
            save_them_prontos();
        },100)
    }

    save_them_prontos();