IE 9 dataTransfer.setData issue

Question

Hi,

If I try to execute the code in the page http://www.w3schools.com/html5/tryit.asp?filename=tryhtml5_draganddrop in internet explorer 9, it works fine. Bu it I try to modify the dataKey name. Then it throws the error "Unexpected call to method or property access". For example if I change the lines to -

ev.dataTransfer.setData("t",ev.target.id);

var data=ev.dataTransfer.getData("t");

Then it throws the above error. Is it an issue with the IE9?

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Thanks AnupDG