fix IE/jQuery problem with menu display

jQuery seems to set style="display:inline-block" when doing slideDown() in IE.
This breaks the arrangement of our <select>s.
Disable the animation for IE.

ChangeLog

@@ -1,3 +1,6 @@
+2012-08-06 2.1.1 Sven-S. Porst <porst@sub.uni-goettingen.de>
+	* Fix jQuery vs IE problem with animations in menu display style
+
 2012-07-27 2.1.0 Sven-S. Porst <porst@sub.uni-goettingen.de>
 	* Change field names in Tev records according to the GND format
 	* Add ability to start the tree with more than one element at the root level

lib/class.tx_nkwgok_menu.php

@@ -150,9 +150,13 @@ function newMenuForSelection" . $this->objectID . " (option) {
 			var newSelect = document.createElement('select');
 			var jNewSelect = jQuery(newSelect);
 			newSelect.setAttribute('level', level);
-			jNewSelect.hide();
+			if (!jQuery.browser.msie) {
+				jNewSelect.hide();
+			}
 			option.form.appendChild(newSelect);
-			jNewSelect.slideDown('fast');
+			if (!jQuery.browser.msie) {
+				jNewSelect.slideDown('fast');
+			}
 			var loadingOption = document.createElement('option');
 			newSelect.appendChild(loadingOption);
 			loadingOption.appendChild(document.createTextNode('" . $this->localise('Laden ...') . "'));