Question

Can anyone see anything wrong with this? It stops the image changing when the image is not here as I want but it does not change the image all the time when it does!

Cheers,
Shaun

var myFile = "/_images/multi/" + productCode + "/" + imgCodeAlt + "_l.jpg";
if (myFile.exists()) {
    $("#imgMain img").attr({
        rel: 'lightbox',
        src: "/_images/multi/" + productCode + "/" + imgCodeAlt + "_l.jpg"
    });
}

Answer 1

Your code will work if you define exists like this:

String.prototype.exists = function() {
    var a = new XMLHttpRequest;
    a.open( "GET", this+"", false );
    a.send( null );
    return a.status === 200;
};

"/".exists() //true