Rounded Corners are not working in IE 10 & IE 9

Rounded Corners are not working in IE 10 & IE 9

I have a website which works perfectly in IE 10 as Browser mode and IE5
quirks as document mode. But the round corners are not working in this
scenario. Rounded corners are working when i change the document mode to
IE 9 standards. But i want IE 5 quirks as document mode.
My CSS is, .roundedcorner { behavior: url(/Includes/border-radius.htc);
-moz-border-radius: 30px; -webkit-border-radius: 30px;
-khtml-border-radius: 30px; border-radius: 30px;
border-top-left-radius:30px; border-top-right-radius:30px;
border-bottom-left-radius:30px; border-bottom-right-radius:30px; } Please
help me in resolving the issue.
Thanks in Advance, Raghava.