As far as I am aware, IE9 should have CSS support for rounded corners. I have apparently coded my page in such a way as this does not occur in IE9 though - although it displ
You only need to define one number for your border radius if you're using "bottom-left" and so on. By specifying two numbers IE9 may not interpret it correctly.
If you use the following, the first number is the top-left, second is top-right, third is bottom-right, and fourth is bottom-left.
-moz-border-radius: 8px 8px 0px 0px;
-webkit-border-radius: 8px 8px 0px 0px;
-0-border-radius: 8px 8px 0px 0px;
border-radius: 8px 8px 0px 0px;