Added option for setting offset for autocomplete list

Author: johannesd

src/jquery.autocomplete.js

@@ -91,7 +91,8 @@
                 showNoSuggestionNotice: false,
                 noSuggestionNotice: 'No results',
                 orientation: 'bottom',
-                forceFixPosition: false
+                forceFixPosition: false,
+                positionOffset: [0, 0]
             };
 
         // Shared variables:
@@ -295,7 +296,8 @@
                 containerHeight = $container.outerHeight(),
                 height = that.el.outerHeight(),
                 offset = that.el.offset(),
-                styles = { 'top': offset.top, 'left': offset.left };
+                styles = { 'top': offset.top + that.options.positionOffset[1],
+                           'left': offset.left + that.options.positionOffset[0] };
 
             if (orientation === 'auto') {
                 var viewPortHeight = $(window).height(),