revert captcha, add stuff to js

contrib/static/overchan.js

@@ -31,7 +31,28 @@ function get_storage() {
     return st;
 }
 
+function setSrcQuery(e, q) {
+	var src  = e.src;
+	var p = src.indexOf('?');
+	if (p >= 0) {
+		src = src.substr(0, p);
+	}
+	e.src = src + "?" + q
+}
 
+function reload(el) {
+	setSrcQuery(el, "reload=" + (new Date()).getTime());
+	return false;
+}
+// captcha reload
+onready(function(){
+  var e = document.getElementById("captcha_img");
+  if (e) {
+    e.onclick = function() {
+		  reload(e);
+	  };
+  }
+});
 
 // rewrite all images to add inline expand
 onready(function() {