diff --git a/platform/lang-impl/src/com/intellij/ide/scriptingContext/LangScriptingContextProvider.java b/platform/lang-impl/src/com/intellij/ide/scriptingContext/LangScriptingContextProvider.java
index 33a6324db490..443e67eaf6cb 100644
--- a/platform/lang-impl/src/com/intellij/ide/scriptingContext/LangScriptingContextProvider.java
+++ b/platform/lang-impl/src/com/intellij/ide/scriptingContext/LangScriptingContextProvider.java
@@ -23,6 +23,8 @@ import com.intellij.openapi.vfs.VirtualFile;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
+import javax.swing.*;
+
 /**
  * @author Rustam Vishnyakov
  */
@@ -44,5 +46,11 @@ public abstract class LangScriptingContextProvider {
   
   @Nullable
   public abstract String getDefaultDocUrl(VirtualFile file);
+  
+  @Nullable
+  public abstract String getOfflineDocUrl(String defaultDocUrl);
+  
+  @Nullable
+  public abstract String downloadOfflineDoc(Project project, String offlineDocUrl, JComponent parent);
 
 }
diff --git a/platform/lang-impl/src/com/intellij/ide/scriptingContext/ui/EditLibraryDialog.form b/platform/lang-impl/src/com/intellij/ide/scriptingContext/ui/EditLibraryDialog.form
index e547839fa495..413d843568fc 100644
--- a/platform/lang-impl/src/com/intellij/ide/scriptingContext/ui/EditLibraryDialog.form
+++ b/platform/lang-impl/src/com/intellij/ide/scriptingContext/ui/EditLibraryDialog.form
@@ -91,7 +91,7 @@
           </hspacer>
         </children>
       </grid>
-      <grid id="2a02c" layout-manager="GridLayoutManager" row-count="4" column-count="2" same-size-horizontally="false" same-size-vertically="false" hgap="-1" vgap="-1">
+      <grid id="2a02c" layout-manager="GridLayoutManager" row-count="5" column-count="2" same-size-horizontally="false" same-size-vertically="false" hgap="-1" vgap="-1">
         <margin top="0" left="0" bottom="0" right="0"/>
         <constraints>
           <grid row="2" column="0" row-span="1" col-span="1" vsize-policy="3" hsize-policy="3" anchor="0" fill="3" indent="0" use-parent-layout="false"/>
@@ -109,7 +109,7 @@
           </component>
           <component id="2c3dd" class="javax.swing.JButton" binding="myRemoveDocUrlButton">
             <constraints>
-              <grid row="1" column="1" row-span="1" col-span="1" vsize-policy="0" hsize-policy="3" anchor="0" fill="1" indent="0" use-parent-layout="false"/>
+              <grid row="2" column="1" row-span="1" col-span="1" vsize-policy="0" hsize-policy="3" anchor="0" fill="1" indent="0" use-parent-layout="false"/>
             </constraints>
             <properties>
               <text resource-bundle="messages/IdeBundle" key="scripting.lib.docUrl.remove"/>
@@ -117,7 +117,7 @@
           </component>
           <scrollpane id="2e869" class="com.intellij.ui.components.JBScrollPane">
             <constraints>
-              <grid row="0" column="0" row-span="3" col-span="1" vsize-policy="3" hsize-policy="3" anchor="0" fill="3" indent="0" use-parent-layout="false">
+              <grid row="0" column="0" row-span="4" col-span="1" vsize-policy="3" hsize-policy="3" anchor="0" fill="3" indent="0" use-parent-layout="false">
                 <minimum-size width="400" height="-1"/>
               </grid>
             </constraints>
@@ -136,14 +136,22 @@
           </scrollpane>
           <vspacer id="6b5fa">
             <constraints>
-              <grid row="2" column="1" row-span="1" col-span="1" vsize-policy="6" hsize-policy="1" anchor="0" fill="2" indent="0" use-parent-layout="false"/>
+              <grid row="3" column="1" row-span="1" col-span="1" vsize-policy="6" hsize-policy="1" anchor="0" fill="2" indent="0" use-parent-layout="false"/>
             </constraints>
           </vspacer>
           <hspacer id="128aa">
             <constraints>
-              <grid row="3" column="0" row-span="1" col-span="1" vsize-policy="1" hsize-policy="6" anchor="0" fill="1" indent="0" use-parent-layout="false"/>
+              <grid row="4" column="0" row-span="1" col-span="1" vsize-policy="1" hsize-policy="6" anchor="0" fill="1" indent="0" use-parent-layout="false"/>
             </constraints>
           </hspacer>
+          <component id="31a1" class="javax.swing.JButton" binding="myDownloadButton">
+            <constraints>
+              <grid row="1" column="1" row-span="1" col-span="1" vsize-policy="0" hsize-policy="3" anchor="0" fill="1" indent="0" use-parent-layout="false"/>
+            </constraints>
+            <properties>
+              <text value="Download"/>
+            </properties>
+          </component>
         </children>
       </grid>
     </children>
diff --git a/platform/lang-impl/src/com/intellij/ide/scriptingContext/ui/EditLibraryDialog.java b/platform/lang-impl/src/com/intellij/ide/scriptingContext/ui/EditLibraryDialog.java
index 17cb54b3e73a..baf05e820c89 100644
--- a/platform/lang-impl/src/com/intellij/ide/scriptingContext/ui/EditLibraryDialog.java
+++ b/platform/lang-impl/src/com/intellij/ide/scriptingContext/ui/EditLibraryDialog.java
@@ -65,6 +65,7 @@ public class EditLibraryDialog extends DialogWrapper {
   private JButton myAddDocUrlButton;
   private JButton myRemoveDocUrlButton;
   private JBList myDocUrlList;
+  private JButton myDownloadButton;
   private Project myProject;
   private FileTableModel myFileTableModel;
   private VirtualFile mySelectedFile;
@@ -110,6 +111,7 @@ public class EditLibraryDialog extends DialogWrapper {
       @Override
       public void intervalAdded(ListDataEvent e) {
         myRemoveDocUrlButton.setEnabled(true);
+        checkDownloadOfflineDocEnabled();
       }
 
       @Override
@@ -117,6 +119,7 @@ public class EditLibraryDialog extends DialogWrapper {
         Object source = e.getSource();
         if (source instanceof MyDocUrlListModel && ((MyDocUrlListModel)source).getDocUrls().length == 0) {
           myRemoveDocUrlButton.setEnabled(false);
+          checkDownloadOfflineDocEnabled();
         }
       }
 
@@ -133,6 +136,14 @@ public class EditLibraryDialog extends DialogWrapper {
       }
     });
     
+    myDownloadButton.addActionListener(new ActionListener() {
+      @Override
+      public void actionPerformed(ActionEvent e) {
+        downloadDocumentation();
+      }
+    });
+    myDownloadButton.setVisible(false); //TODO<rv> Remove
+    
     myRemoveDocUrlButton.addActionListener(new ActionListener() {
       @Override
       public void actionPerformed(ActionEvent e) {
@@ -161,6 +172,28 @@ public class EditLibraryDialog extends DialogWrapper {
     if (docUrls.length > 0) {
       myRemoveDocUrlButton.setEnabled(true);
     }
+    checkDownloadOfflineDocEnabled();
+  }
+  
+  private void checkDownloadOfflineDocEnabled() {
+    for (String url : getDocUrls()) {
+      if (myProvider.getOfflineDocUrl(url) != null) {
+        myDownloadButton.setEnabled(true);
+        return;
+      }
+    }
+    myDownloadButton.setEnabled(false);
+  }
+  
+  private void downloadDocumentation() {
+    for (String url : getDocUrls()) {
+      String offlineDocUrl = myProvider.getOfflineDocUrl(url); 
+      if (offlineDocUrl != null) {
+        String targetFile = myProvider.downloadOfflineDoc(myProject, offlineDocUrl, getRootPane());
+        myDocUrlListModel.addUrl(targetFile);
+        return;
+      }
+    }
   }
   
   private class MyTableCellRenderer extends DefaultTableCellRenderer {
@@ -454,10 +487,13 @@ public class EditLibraryDialog extends DialogWrapper {
     }
     
     public int addUrl(String url) {
-      myDocUrls.add(url);
-      int newIndex = myDocUrls.indexOf(url);
-      fireIntervalAdded(this, newIndex, newIndex);
-      return newIndex;
+      if (!myDocUrls.contains(url)) {
+        myDocUrls.add(url);
+        int newIndex = myDocUrls.indexOf(url);
+        fireIntervalAdded(this, newIndex, newIndex);
+        return newIndex;
+      }
+      return myDocUrls.indexOf(url);
     }
     
     public int indexOf(String url) {
@@ -491,6 +527,7 @@ public class EditLibraryDialog extends DialogWrapper {
       int index = myDocUrlListModel.addUrl(url);
       myDocUrlList.ensureIndexIsVisible(index);
       myDocUrlList.setSelectedIndex(index);
+      checkDownloadOfflineDocEnabled();
     }
   }