Fix docs to jquery ui position, fixed #274

docs.html

@@ -160,7 +160,7 @@ <h3 id="options">options (at registration)</h3>
         <dt id="options-determinePosition"><em>(function)</em> determinePosition</dt>
         <dd>
             <p>Determine the position of the menu in respect to the given trigger object.</p>
-            <p>Hint: <a href="http://docs.jquery.com/UI/Position">jQuery UI's position()</a> may ease things up.</p>
+            <p>Hint: <a href="http://api.jqueryui.com/position/">jQuery UI's position()</a> may ease things up.</p>
             <p>Example: <code>$menu.css('display', 'block').position({ my: "center top", at: "center bottom", of: this, offset: "0 5"}).css('display', 'none');</code></p>
         </dd>