wrap removes expandos (jQuery 1.2.1)

wrap removes expandos (jQuery 1.2.1)


When you create an element (using document.createElement) and add
expands to it, they are removed when that element is used to wrap
another one.
Example:
http://www.texotela.co.uk/wrapexpandos.php
I use this method for my focusfields plugin, and as a result it does
not work in Internet Explorer if jQuery 1.2.1 is used.