Fix broken submission in firefox

- apparently have to define functions before using them...

lms/templates/problem.html

@@ -49,15 +49,16 @@
         return false;
       });
 
-      if(!collapsibleSet) {
-        collapsibleSet = true;
-        $('.collapsible section').hide();
-        $('.collapsible header a').bind('click', toggleHint);
       function toggleHint(e) {
         $(this).parent().siblings().slideToggle();
         $(this).parent().parent().toggleClass('open');
         return false;
       }
+
+      if(!collapsibleSet) {
+        collapsibleSet = true;
+        $('.collapsible section').hide();
+        $('.collapsible header a').bind('click', toggleHint);
       }      
     });
 </script>