diff --git a/modules/server_add/js/server_add.js b/modules/server_add/js/server_add.js
index 918bd14b..ada09d65 100644
--- a/modules/server_add/js/server_add.js
+++ b/modules/server_add/js/server_add.js
@@ -41,6 +41,14 @@ function click_node(checkbox) {
   var parent = $(checkbox).parents("li").get(0);
   var checked = $(checkbox).attr("checked");
   $(parent).find("input[type=checkbox]").attr("checked", checked);
+
+  if ($("#gServerAddTree").find("input[type=checkbox]").is(":checked")) {
+    $("#gServerAddAddButton").attr("disabled", true);
+    $("#gServerAddAddButton").removeClass("ui-state-disabled");
+  } else {
+    $("#gServerAddAddButton").attr("disabled", false);
+    $("#gServerAddAddButton").addClass("ui-state-disabled");
+  }
 }
 
 /* ================================================================================ */
diff --git a/modules/server_add/views/server_add_tree_dialog.html.php b/modules/server_add/views/server_add_tree_dialog.html.php
index 6e4db620..723d388e 100644
--- a/modules/server_add/views/server_add_tree_dialog.html.php
+++ b/modules/server_add/views/server_add_tree_dialog.html.php
@@ -25,8 +25,10 @@
   </ul>
 
   <span>
-    <?= form::submit(array("id" => "gServerPauseButton", "name" => "add", "disabled" => true, "class" => "submit", "style" => "display:none"), t("Pause")) ?>
-    <?= form::submit(array("id" => "gServerAddButton", "name" => "add", "disabled" => true, "class" => "submit"), t("Add")) ?>
+    <input id="gServerAddPauseButton" class="submit ui-state-disabled" disabled="disabled" type="submit"
+           value="<?= t("Pause") ?>" style="display: none">
+    <input id="gServerAddAddButton" class="submit ui-state-disabled" disabled="disabled" type="submit"
+           value="<?= t("Add") ?>">
   </span>
   <?= form::close() ?>
   <div class="gProgressBar" style="visibility: hidden" ></div>