See this test-case: http://jsfiddle.net/SzZ8q/1/
Fixing Issue #48 - IE9 reports img.href instead of img.src
Nice one! IE9 has a problem: "href" in document.createElement('img') === true;
"href" in document.createElement('img') === true;
I switched the order of properties and it should work now. the fix is included in v1.7.3 (available as of now).
That's a quick fix! Thanks.