Fixed easytabs height transition error for jquery 1.8 and IE7.

lib/jquery.easytabs.js

@@ -603,12 +603,23 @@
 
       // this is the only property easytabs changes, so we need to grab its value on each tab change
       var display = $targetPanel.css('display'),
-
-          // Workaround, because firefox returns wrong height if element itself has absolute positioning
-          height = $targetPanel
-            .wrap($('<div>', {position: 'absolute', 'visibility': 'hidden', 'overflow': 'hidden'}))
-            .css({'position':'relative','visibility':'hidden','display':'block'})
-            .outerHeight();
+          outerCloak,
+          height;
+
+      // Workaround with wrapping height, because firefox returns wrong
+      // height if element itself has absolute positioning.
+      // but try/catch block needed for IE7 and IE8 because they throw
+      // an "Unspecified error" when trying to create an element
+      // with the css position set.
+      try {
+        outerCloak = $('<div></div>', {'position': 'absolute', 'visibility': 'hidden', 'overflow': 'hidden'});
+      } catch (e) {
+        outerCloak = $('<div></div>', {'visibility': 'hidden', 'overflow': 'hidden'});
+      }
+      height = $targetPanel
+        .wrap(outerCloak)
+        .css({'position':'relative','visibility':'hidden','display':'block'})
+        .outerHeight();
 
       $targetPanel.unwrap();