const guideContents = document.querySelectorAll(".guide-content"); const guideButtons = document.querySelectorAll(".guide"); function changeGuide(newID) { guideContents.forEach(content => { if (content.id == newID) { content.style.display = "block"; } else { content.style.display = "none"; } }) guideButtons.forEach(button => { let gid = button.id.slice(1); if (gid == newID) { button.classList.add("active"); } else { if (button.classList.contains("active")) { button.classList.remove("active"); } } }) }