added id to login button

js/headfoot.js

@@ -125,6 +125,7 @@ function head(){
             }
             headitem.appendChild(combodiv);
         }else if(itemtype=='loginbutton'){
+            headlink.id="loginbutton";
             if(userAuthenticated()){
                 headlink.innerHTML="Account";
                 headlink.href="/account/";