I need an new option( onpreloaderror ) to see if it fail to load the image

[zemzheng]

In my case I need to know if it fail to load the image.

I put the image in CDN, and if there is something wrong with CDN sync, I need to use the local image instead.

So I think it would be useful to add an option : onpreloaderror. EXP:

function swap2LocalImage( cdn_url ){
    // return the image url in local
}

$( 'img' ).lazyload({
    placeholder    : './img-default.png',
    data_attribute : 'src',
    onpreloaderror : function(){
                        var $this = $( this );
                        $this.attr( 'src', swap2LocalImage( $this.data( 'src' ) ) );
                     }
});