Function to add standard NetSuite Customer Quickadd form onto a Suitelet Using HTML.

function openNewCustomerForm() {
// Create a modal overlay
let modalOverlay = document.createElement('div');
modalOverlay.className = 'modal-overlay';
document.body.appendChild(modalOverlay);                        
// Create a modal container
                        let modalContainer = document.createElement('div');
                        modalContainer.className = 'modal-container';
                        document.body.appendChild(modalContainer);

                        // Create an iframe inside the modal container
                        let iframe = document.createElement('iframe');
                        iframe.src = 'https://7177173-sb3.app.netsuite.com/app/common/entity/custjob.nl?target=main:entity&label=Customer';
                        modalContainer.appendChild(iframe);

                        // New edits to hide cancel button
                        iframe.onload = function () {
                            let iframeDocument = iframe.contentDocument;

                            // Hide the cancel button
                            let cancelButton = iframeDocument.getElementById('tbl_close');
                            if (cancelButton) {
                                cancelButton.style.display = 'none';
                            }

                            // Hide the secondarycancel button
                            let secondaryCancelButton = iframeDocument.getElementById('tbl_secondaryclose');
                            if (secondaryCancelButton) {
                                secondaryCancelButton.style.display = 'none';
                            }
                        };