.rounded-corners {
	-moz-border-radius: 10px;        /* for Firefox */
	-webkit-border-radius: 10px;     /* for Safar and Chrome */
	-khtml-border-radius:  10px;     /* for Konqueror * /
	border-radius: 10px;             /* the css official Syntax */
	behavior:url(border-radius.htc); /* for IE  */
}
if you have any problam with this on IE, be sour your server have "text/x-component" MIME Type.


This solution was tested on IE 7 , fox 3.6, GC 8.0, Opera 11.01, Safar 4.0
(3/02/2011)
rounded corners