Parsing xml not working in IE6

Parsing xml not working in IE6

Hello,

i have this code:
xml='<data><a>asd</a></data>';
alert($("a", xml).length);
alert($(xml).find('a').size());

which works in FF and Opera (both alerts give 1) but does not work in IE6 (alerts give 0). IE version is 6.0.2900.2180. JQuery version is 1.2.6.

Any help? Thanks