$.ajax(
{
    url: link,
    type:'HEAD',
    timeout: 2000,
    error: function(request, status, message)
    {
        console.log('ajax error');
        console.log(request);
        console.log(status);
        console.log(message);
        openPopUp("There was an error accessing the image. It can be because the address is invalid, "+
            "or because the server where the image is stored is not allowing direct access to the images.");
    },
    success: function()
    {
        // More stuff here
    }
});