diff --git a/Templates/Build/wwupgrade.tpl b/Templates/Build/wwupgrade.tpl
index ddec728e..4b1ab268 100644
--- a/Templates/Build/wwupgrade.tpl
+++ b/Templates/Build/wwupgrade.tpl
@@ -44,6 +44,7 @@ if($bindicate == 1) {
 	$master = count($database->getMasterJobsByField($village->wid,$id));
 	$uprequire = $building->resourceRequired($id,$village->resarray['f'.$id.'t'],1+$loopsame+$doublebuild+$master);
 	$mastertime = $uprequire['time'];
+    $_SESSION['mas'][$bid]=$bid.",".$id.",".$mastertime;  
 ?>
 <p id="contract"><b>Costs</b> for upgrading to level <?php echo $village->resarray['f'.$id]+1+$loopsame+$doublebuild+$master; ?>:<br />
 <img class="r1" src="img/x.gif" alt="Lumber" title="Lumber" /><span class="little_res"><?php echo $uprequire['wood']; ?></span> | <img class="r2" src="img/x.gif" alt="Clay" title="Clay" /><span class="little_res"><?php echo $uprequire['clay']; ?></span> | <img class="r3" src="img/x.gif" alt="Iron" title="Iron" /><span class="little_res"><?php echo $uprequire['iron']; ?></span> | <img class="r4" src="img/x.gif" alt="Crop" title="Crop" /><span class="little_res"><?php echo $uprequire['crop']; ?></span> | <img class="r5" src="img/x.gif" alt="Crop consumption" title="Crop consumption" /><?php echo $uprequire['pop']; ?> | <img class="clock" src="img/x.gif" alt="duration" title="duration" /><?php echo $generator->getTimeFormat($uprequire['time']); 
@@ -58,7 +59,7 @@ if($session->userinfo['gold'] >= 3 && $building->getTypeLevel(17) >= 1) {
 <?php
 	if($id <= 18) {
 	if($session->gold >= 1 && $village->master == 0){
-	    echo "<a class=\"build\" href=\"dorf1.php?master=$bid&id=$id&time=$mastertime\">Constructing with master builder </a>";
+	    echo "<a class=\"build\" href=\"dorf1.php?master=$bid&id=$id&time=$mastertime&c=$session->checker\">Constructing with master builder </a>";
 		echo '<font color="#B3B3B3">(costs: <img src="'.GP_LOCATE.'img/a/gold_g.gif" alt="Gold" title="Gold"/>1)</font>';
 	}else{
 		echo "<span class=\"none\">Constructing with master builder</span>";
@@ -66,7 +67,7 @@ if($session->userinfo['gold'] >= 3 && $building->getTypeLevel(17) >= 1) {
 	}
 	}else{
 	if($session->gold >= 1 && $village->master == 0){
-	    echo "<a class=\"build\" href=\"dorf2.php?master=$bid&id=$id&time=$mastertime\">Constructing with master builder </a>";
+	    echo "<a class=\"build\" href=\"dorf2.php?master=$bid&id=$id&time=$mastertime&c=$session->checker\">Constructing with master builder </a>";
 		echo '<font color="#B3B3B3">(costs: <img src="'.GP_LOCATE.'img/a/gold_g.gif" alt="Gold" title="Gold"/>1)</font>';
 	}else{
 		echo "<span class=\"none\">Constructing with master builder</span>";
@@ -82,7 +83,7 @@ if($session->userinfo['gold'] >= 3 && $building->getTypeLevel(17) >= 1) {
 <?php
 	if($id <= 18) {
 	if($session->gold >= 1 && $village->master == 0){
-	    echo "<a class=\"build\" href=\"dorf1.php?master=$bid&id=$id&time=$mastertime\">Constructing with master builder </a>";
+	    echo "<a class=\"build\" href=\"dorf1.php?master=$bid&id=$id&time=$mastertime&c=$session->checker\">Constructing with master builder </a>";
 		echo '<font color="#B3B3B3">(costs: <img src="'.GP_LOCATE.'img/a/gold_g.gif" alt="Gold" title="Gold"/>1)</font>';
 	}else{
 		echo "<span class=\"none\">Constructing with master builder</span>";
@@ -90,7 +91,7 @@ if($session->userinfo['gold'] >= 3 && $building->getTypeLevel(17) >= 1) {
 	}
 	}else{
 	if($session->gold >= 1 && $village->master == 0){
-	    echo "<a class=\"build\" href=\"dorf2.php?master=$bid&id=$id&time=$mastertime\">Constructing with master builder </a>";
+	    echo "<a class=\"build\" href=\"dorf2.php?master=$bid&id=$id&time=$mastertime&c=$session->checker\">Constructing with master builder </a>";
 		echo '<font color="#B3B3B3">(costs: <img src="'.GP_LOCATE.'img/a/gold_g.gif" alt="Gold" title="Gold"/>1)</font>';
 	}else{
 		echo "<span class=\"none\">Constructing with master builder</span>";
@@ -120,7 +121,7 @@ if($session->userinfo['gold'] >= 3 && $building->getTypeLevel(17) >= 1) {
 <?php
 	if($id <= 18) {
 	if($session->gold >= 1 && $village->master == 0){
-	    echo "<a class=\"build\" href=\"dorf1.php?master=$bid&id=$id&time=$mastertime\">Constructing with master builder </a>";
+	    echo "<a class=\"build\" href=\"dorf1.php?master=$bid&id=$id&time=$mastertime&c=$session->checker\">Constructing with master builder </a>";
 		echo '<font color="#B3B3B3">(costs: <img src="'.GP_LOCATE.'img/a/gold_g.gif" alt="Gold" title="Gold"/>1)</font>';
 	}else{
 		echo "<span class=\"none\">Constructing with master builder</span>";
@@ -128,7 +129,7 @@ if($session->userinfo['gold'] >= 3 && $building->getTypeLevel(17) >= 1) {
 	}
 	}else{
 	if($session->gold >= 1 && $village->master == 0){
-	    echo "<a class=\"build\" href=\"dorf2.php?master=$bid&id=$id&time=$mastertime\">Constructing with master builder </a>";
+	    echo "<a class=\"build\" href=\"dorf2.php?master=$bid&id=$id&time=$mastertime&c=$session->checker\">Constructing with master builder </a>";
 		echo '<font color="#B3B3B3">(costs: <img src="'.GP_LOCATE.'img/a/gold_g.gif" alt="Gold" title="Gold"/>1)</font>';
 	}else{
 		echo "<span class=\"none\">Constructing with master builder</span>";