diff --git a/homepage/static/assets/js/captcha_refresh.js b/homepage/static/assets/js/captcha_refresh.js
index 4f7cc6c..c937113 100644
--- a/homepage/static/assets/js/captcha_refresh.js
+++ b/homepage/static/assets/js/captcha_refresh.js
@@ -1,27 +1,20 @@
 const g_captcha_timeout_seconds = 600;
 
-const captcha_hidden_field = document.forms[0].children[4].children[0];
+const e_captcha = document.getElementsByClassName("captcha")[0];
 
 let g_captcha_timeout_remain = g_captcha_timeout_seconds;
-let g_current_captcha_id = captcha_hidden_field.value;
-
-function getColorScheme() {
-	return window.matchMedia("(prefers-color-scheme: light)").matches ? "light" : "dark";
-}
+let g_current_captcha_id = e_captcha.children[0].value;
 
 async function getNewCaptcha() {
 	const id = await fetch("/api/captcha/", { method: "POST"}).then(r => r.text());
-	g_current_captcha_id = id;
-	captcha_hidden_field.value = id;
-	setTimeout(() => { captcha_img.src = `/api/captcha/${id}/image?style=${getColorScheme()}` }, 600);
+	g_current_captcha_id = e_captcha.children[0].value = id;
+	const style = window.matchMedia("(prefers-color-scheme: light)").matches ? "light" : "dark";
+	setTimeout(() => { e_captcha.children[1].src = `/api/captcha/${id}/image?style=${style}` }, 600);
 	g_captcha_timeout_remain = g_captcha_timeout_seconds;
 }
 
-const captcha_span = document.getElementsByClassName("captcha")[0];
-const captcha_img = captcha_span.children[1];
-
-captcha_span.classList.toggle("refresh");
-captcha_span.children[3].innerHTML =
+e_captcha.classList.toggle("refresh");
+e_captcha.children[3].innerHTML =
 	`<button id="refresh">Refresh</button>ed in <b><span id="remain">600</span></b> seconds.`;
 
 const captcha_refresh = document.getElementById("refresh");
@@ -30,11 +23,11 @@ const captcha_remain = document.getElementById("remain");
 captcha_refresh.classList.toggle("refresh");
 captcha_refresh.addEventListener("click", async e => {
 	e.preventDefault();
-	captcha_refresh.disabled = true;
+	e.target.disabled = true;
 	setTimeout(async () => {
-		captcha_refresh.disabled = false;
+		e.target.disabled = false;
 		await fetch(`/api/captcha/${g_current_captcha_id}?remove`); }, 3000);
-	document.getElementsByName("captcha_answer")[0].value = "";
+	e_captcha.children[2].value = "";
 	await getNewCaptcha();
 });