diff --git a/dev/js/src/util.js b/dev/js/src/util.js
index b3bb423..f3df4fc 100644
--- a/dev/js/src/util.js
+++ b/dev/js/src/util.js
@@ -41,6 +41,21 @@
   KorAP.API = KorAP.API || {};
   KorAP.Locale = KorAP.Locale || {};
 
+  var loc = KorAP.Locale;
+  loc.OR  = loc.OR  || 'or';
+  loc.AND = loc.AND || 'and';
+
+  // Add new stylesheet object lazily to document
+  KorAP.newStyleSheet = function () {
+    if (KorAP._sheet === undefined) {
+      var sElem = document.createElement('style');
+      document.head.appendChild(sElem);
+      KorAP._sheet = sElem.sheet;
+    };
+    return KorAP._sheet;
+  };
+
+
   // Default log message
   KorAP.log = KorAP.log || function (type, msg) {
     console.log(type + ": " + msg);
diff --git a/dev/js/src/vc.js b/dev/js/src/vc.js
index 65ac5ca..4598275 100644
--- a/dev/js/src/vc.js
+++ b/dev/js/src/vc.js
@@ -38,13 +38,13 @@
 ], function (unspecDocClass, docClass, docGroupClass) {
   "use strict";
 
+  // ???
   KorAP._validStringMatchRE = new RegExp("^(?:eq|ne|contains|excludes)$");
-  // KorAP._validRegexMatchRE  = new RegExp("^(?:eq|ne)$");
   KorAP._validDateMatchRE   = new RegExp("^[lg]?eq$");
   KorAP._validDateRE        = new RegExp("^(?:\\d{4})(?:-\\d\\d(?:-\\d\\d)?)?$");
-  // KorAP._validGroupOpRE     = new RegExp("^(?:and|or)$");
-  // KorAP._quote              = new RegExp("([\"\\\\])", 'g');
+  KorAP._overrideStyles     = false;
 
+  var loc = KorAP.Locale;
 
   /**
    * Virtual Collection
@@ -54,8 +54,36 @@
       return null;
     },
 
+    _init : function () {
+      if (!KorAP._overrideStyles) {
+	var sheet = KorAP.newStyleSheet();
+
+	// Add css rule for OR operations
+	sheet.insertRule(
+	  '.vc .docGroup[data-operation=or] > .doc::before,' +
+	  '.vc .docGroup[data-operation=or] > .docGroup::before ' +
+	    '{ content: "' + loc.OR + '" }',
+	  0
+	);
+
+	// Add css rule for AND operations
+	sheet.insertRule(
+	  '.vc .docGroup[data-operation=and] > .doc::before,' +
+	  '.vc .docGroup[data-operation=and] > .docGroup::before ' +
+	    '{ content: "' + loc.AND + '" }',
+	  1
+	);
+
+	console.log(sheet);
+
+	KorAP._overrideStyles = true;
+      };
+
+      return this;
+    },
+
     create : function () {
-      return Object.create(this);
+      return Object.create(this)._init();
     },
 
     clean : function () {
@@ -67,7 +95,7 @@
     },
 
     render : function (json) {
-      var obj = Object.create(this);
+      var obj = Object.create(this)._init();
 
       if (json !== undefined) {
 	// Root object
diff --git a/dev/js/src/vc/docgroup.js b/dev/js/src/vc/docgroup.js
index 5e5f010..0db4b4c 100644
--- a/dev/js/src/vc/docgroup.js
+++ b/dev/js/src/vc/docgroup.js
@@ -12,6 +12,8 @@
 
   var _validGroupOpRE = new RegExp("^(?:and|or)$");
 
+  var loc = KorAP.Locale;
+
   var docGroupClass = {
     _ldType : "docGroup",
 
diff --git a/dev/js/src/vc/operators.js b/dev/js/src/vc/operators.js
index 9b0ebd1..91f009f 100644
--- a/dev/js/src/vc/operators.js
+++ b/dev/js/src/vc/operators.js
@@ -4,8 +4,6 @@
 define(['util'], function () {
 
   var loc = KorAP.Locale;
-  loc.AND   = loc.AND   || 'and';
-  loc.OR    = loc.OR    || 'or';
   loc.DEL   = loc.DEL   || '×';