Refactored formatting panel code

boards/static/js/panel.js

@@ -34,24 +34,31 b' function addMarkToMsg(start, end) {'
         return addTextToEachLineOfSelection(start);
     }
 
-    var textareas = document.getElementsByTagName('textarea');
+    var textareas = $('textarea');
 
     for (var i = 0; i < textareas.length; i++) {
         var textarea = textareas[i];
 
         if( document.selection ) {
             textarea.focus();
+
             var sel = document.selection.createRange();
             sel.text = start + sel.text + end;
         } else if(textarea.selectionStart || textarea.selectionStart == '0') {
             textarea.focus();
+
             var startPos = textarea.selectionStart;
             var endPos = textarea.selectionEnd;
-            textarea.value = textarea.value.substring(0, startPos) + start + textarea.value.substring(startPos, endPos) + end + textarea.value.substring( endPos, textarea.value.length );
+
+            var oldValue = textarea.value;
+            textarea.value = oldValue.substring(0, startPos) + start +
+                    oldValue.substring(startPos, endPos) + end +
+                    oldValue.substring(endPos, oldValue.length);
         } else {
             textarea.value += start + end;
         }
     }
+
     return false;
 }
 
@@ -117,4 +124,4 b' function getLinesRange(start, end, value'
         rangeEnd = i;
     }
     return [rangeStart, rangeEnd];
-}
  No newline at end of file
+}