Loading image in Netsuite records

let loadingDiv = document.createElement("div");
                loadingDiv.id = "loading-symbol";
                loadingDiv.style.position = "fixed";
                loadingDiv.style.top = "50%";
                loadingDiv.style.left = "50%";
                loadingDiv.style.transform = "translate(-50%, -50%)";
 
                let fileId = 13826; //internal ID of your image file in the NetSuite File Cabinet.
 
                let imageFileURL = nlapiResolveURL("mediaitem", fileId);
                loadingDiv.innerHTML =
                    '<img src="' + imageFileURL + '" alt="Loading...">';
                document.body.appendChild(loadingDiv);