<img src="<?= base_url(); ?>img/face1.jpg" id="icon"> //<-- this function is from codeigniter, to get the base url

$(document).ready(function(){
$("#icon").mouseover(function() {
    $(this).fadeOut(1000);
}).mouseout(function(){
    $(this).fadeIn(1000);
});});

$(document).ready(function() {
    $("#icon").mouseenter(function() {
        $(this).fadeOut(1000);
    }).mouseout(function() {
        $(this).fadeIn(1000);
    });
});