jQuery(function ($) {
$(document).ready(function() {
$('.itemid-329 .sp-default-logo').attr('src', '../images/logo-white.png');
});
});
With Joomla 4 and Helix Ultimate 2 you have to use this:
jQuery(function ($) {
$(document).ready(function() {
$('.itemid-329 .sp-default-logo').attr('srcset', '../images/logo-white.png');
});
});