+
+ // Opera adds border for fixed, relative and absolute parent elements
+ if (opera && /^fixed|relative|absolute$/i.test(position))
+ add(
+ -parseInt(jQuery.css(elem, "borderLeftWidth")),
+ -parseInt(jQuery.css(elem, "borderTopWidth"))
+ );
+
+ // Add the document scroll offsets if position is fixed
+ if ( !fixed && position == "fixed" )
+ fixed = true;