/* usage */
$(document).ready(function() {

$('#image-hot-zone').hover(
    function() {
			$('#image-logo-equation').css({'display':'block'});
			$('#image-logo-equation').stop().animate({opacity:'1'}, {queue:false, duration:800, easing:"easeOutCubic"});
        }, function () {
			$('#image-logo-equation').stop().animate({opacity:'0'}, {queue:false, duration:1600, easing:"easeOutCubic"});
    });

});