Index: C:/Documents and Settings/AresXP/workspace/L2Z_GSC5/src/main/java/net/sf/l2j/gameserver/model/entity/Siege.java
===================================================================
--- C:/Documents and Settings/AresXP/workspace/L2Z_GSC5/src/main/java/net/sf/l2j/gameserver/model/entity/Siege.java	(revision 32)
+++ C:/Documents and Settings/AresXP/workspace/L2Z_GSC5/src/main/java/net/sf/l2j/gameserver/model/entity/Siege.java	(working copy)
@@ -716,7 +716,8 @@
         {
             if(player.getClan().getAllyId() == allyId && !force)
             {
-                player.sendMessage("You cannot register as an attacker because your alliance owns the castle");
+                //You cannot register on the attacking side because you are part of an alliance with the clan that owns the castle.
+                player.sendPacket(new SystemMessage(690));
                 return; 
             }
         }
@@ -735,6 +736,7 @@
 
     public void registerDefender(L2PcInstance player, boolean force)
     {
+        //TODO: No system message like that on retail... possible to change?
         if (getCastle().getOwnerId() <= 0) player.sendMessage("You cannot register as a defender because "
             + getCastle().getName() + " is owned by NPC.");
         else if (force || this.checkIfCanRegister(player)) saveSiegeClan(player.getClan(), 2, false); // Save to database
@@ -895,20 +897,51 @@
      */
     private boolean checkIfCanRegister(L2PcInstance player)
     {
-        if (getIsRegistrationOver()) player.sendMessage("The deadline to register for the siege of "
-            + getCastle().getName() + " has passed.");
-        else if (getIsInProgress()) player.sendMessage("This is not the time for siege registration and so registration and cancellation cannot be done.");
+        if (getIsRegistrationOver()) 
+        {
+            //The deadline to register for the siege of $s1 has passed.
+            SystemMessage sm = new SystemMessage(845);
+            sm.addString(getCastle().getName());
+            player.sendPacket(sm);
+            sm = null;
+        	return false;
+        }
+        else if (getIsInProgress()) 
+        {
+            //This is not the time for siege registration and so registration and cancellation cannot be done.
+        	player.sendPacket(new SystemMessage(660));
+        	return false;
+        }
         else if (player.getClan() == null
-            || player.getClan().getLevel() < SiegeManager.getInstance().getSiegeClanMinLevel()) player.sendMessage("Only clans with Level "
-            + SiegeManager.getInstance().getSiegeClanMinLevel()
-            + " and higher may register for a castle siege.");
-        else if (player.getClan().getHasCastle() > 0) player.sendMessage("You cannot register because your clan already own a castle.");
+            || player.getClan().getLevel() < SiegeManager.getInstance().getSiegeClanMinLevel()) 
+        {
+            //Only clans of level 4 or higher may register for a castle siege.
+            player.sendPacket(new SystemMessage(645));
+        	return false;
+        }
+        else if (player.getClan().getHasCastle() > 0) 
+        {
+            //A clan that owns a castle cannot participate in another siege.
+        	player.sendPacket(new SystemMessage(689));
+        	return false;
+        }
         else if (player.getClan().getClanId() == getCastle().getOwnerId())
+        {
             player.sendPacket(new SystemMessage(SystemMessage.CLAN_THAT_OWNS_CASTLE_IS_AUTOMATICALLY_REGISTERED_DEFENDING));
-        else if (SiegeManager.getInstance().checkIsRegistered(player.getClan(), getCastle().getCastleId())) player.sendMessage("You are already registered in a Siege.");
-        else return true;
-
-        return false;
+            return false;
+        }
+        else 
+        {
+        	for(int i=0; i<10; i++)
+        	{
+                //Your application has been denied because you have already submitted a request for another Siege Battle.
+        		if (SiegeManager.getInstance().checkIsRegistered(player.getClan(), i)) {
+        			player.sendPacket(new SystemMessage(639));
+        			return false;
+        		}
+        	}
+        }
+        return true;
     }
 
     /**