Excellent!!
I used this in the custom CSS:
#nd-gridrowimage {
background: url(“http://mostlynet.org/pc-security/wp-content/uploads/2015/12/ny-city-gray.jpg”);
background-attachment: fixed !important;
background-position: center center !important;
background-size: contain !important;
}

Is there any way to achieve the parallax effect instead of just fixed (background-attachment: fixed) – I tried with no luck.

Thanks a lot for the main fix.