javascript on image load

1    window.onload = function () {
2
3        var logo = document.getElementById('sologo');
4
5        logo.onload = function () {
6            alert ("The image has loaded!");		
7        };
8
9        setTimeout(function(){
10            logo.src = 'https://edmullen.net/test/rc.jpg';         
11        }, 5000);
12    };