Index: core/src/com/icesoft/faces/webapp/command/UpdateElements.java
===================================================================
+++ core/src/com/icesoft/faces/webapp/command/UpdateElements.java
@@ -43,12 +43,15 @@
 import java.util.Arrays;
 import java.util.regex.Pattern;
 
 public class UpdateElements extends AbstractCommand {
     private final static Pattern START_CDATA = Pattern.compile("<\\!\\[CDATA\\[");
     private final static Pattern END_CDATA = Pattern.compile("\\]\\]>");
+    private final static String SCRIPT = "script";
+    private final static String SEMI_COLON = ";";
+    private final static String COMMENT_START = "//";
     private Element[] updates;
     private boolean coalesce = true;
 
     public UpdateElements(boolean coalesce, Element[] updates) {
         this.updates = updates;
         this.coalesce = coalesce;
@@ -62,12 +65,15 @@
             Element previousUpdate = previousUpdates[i];
             boolean overriden = false;
             //test if any of the new updates is replacing the same element
             for (int j = 0; j < updates.length; j++) {
                 Element update = updates[j];
                 if (update.getAttribute("id").equals(previousUpdate.getAttribute("id"))) {
+                    if (update.getNodeName().equals(SCRIPT)) {
+                        coalesceScripts(previousUpdate, update);
+                    }
                     overriden = true; break;
                 }
             }
             //drop overriden updates
             if (!overriden) {
                 coallescedUpdates.add(previousUpdate);
@@ -155,7 +161,39 @@
                 writer.write("]]></content>");
             }
             writer.write("</update>");
         }
         writer.write("</updates>");
     }
+
+    private void coalesceScripts(Element previousUpdate, Element currentUpdate) {
+        String previousUpdateScript = previousUpdate.getFirstChild().getTextContent();
+        StringBuilder sb = new StringBuilder(previousUpdateScript);
+        int lastCommentPos = previousUpdateScript.lastIndexOf(COMMENT_START);
+        int lastSemicolonPos = previousUpdateScript.lastIndexOf(SEMI_COLON);
+        if (lastCommentPos > lastSemicolonPos) {
+            sb.delete(lastCommentPos, previousUpdateScript.length());
+        }
+        String[] currentCommands = currentUpdate.getFirstChild().getTextContent().split(SEMI_COLON);
+        boolean commandsAdded = false;
+        String lastComment = null;
+
+        for (int i = 0; i < currentCommands.length; i++) {
+            String command = currentCommands[i];
+            if (command.startsWith(COMMENT_START)) {
+                lastComment = command;
+            } else if (!(previousUpdateScript.contains(command))) {
+                sb.append(command);
+                sb.append(SEMI_COLON);
+                commandsAdded = true;
+            }
+        }
+
+        if (lastComment != null) {
+            sb.append(lastComment);
+        }
+
+        if (commandsAdded) {
+            currentUpdate.getFirstChild().setTextContent(sb.toString());
+        }
+    }
 }