hey again @rwp! You kindly directed me here from the other forum. Any further help really would be so appreciated! I must admit there's a bit of guess work going on here from my end but this is where I'm at with it... I've copied the code from above and added in links to the images I uploaded via the 'manage custom files' section in Custom CSS. I've also added in all the code from jQuery 3.x and then pasted everything into the code injection for the Header section (not sure if this is the best location for it?). Do you know where I'm going wrong..? My site and password is above and the code is below:
<script src="https://code.jquery.com/jquery-3.5.1.min.js" integrity="sha256-9/aliU8dGd2tb6OSsuzixeV4y/faTqgFtohetphbbj0=" crossorigin="anonymous"></script>
<script>
var topIMG = "https://static1.squarespace.com/static/5ede1a2e999dc0531d6f9ebf/t/5ee8e35dfcadf46aef884a77/1592320861718/Eleven_circle_solo.png";
var sclIMG = "https://static1.squarespace.com/static/5ede1a2e999dc0531d6f9ebf/t/5ee8d2ecb1f80f408deb0b1e/1592316654032/Eleven_lockup_white02.png";
$('img[alt="Eleven"]').attr("class", "logo")
$(window).scroll(function() {
var value = $(this).scrollTop();
if (value > 50)
$(".logo").attr("src", sclIMG);
else
$(".logo").attr("src", topIMG);
});</script>