SO - 29935464

by Arun P Johny

HTML

<img src="l.jpg" />
<img src="a.jpg" />

JavaScript

window.onload = function () {
    x = document.getElementsByTagName('img');
    for (var i = 0; i < x.length; i++) {
        if (x[i].getAttribute('src').charAt(0) !== 'l') {
            window.alert("message")
        }
    }
}