add the css properties
-moz-border-radius: 5px 5px 5px 5px;
-khtml-border-radius: 5px 5px 5px 5px;
-webkit-border-radius: 5px 5px 5px 5px;
example:
.hightlightImage{
-moz-border-radius: 5px 5px 5px 5px;
-khtml-border-radius: 5px 5px 5px 5px;
-webkit-border-radius: 5px 5px 5px 5px;

padding-right:1px;
height:60px;
width:90px;
border:thick solid #FFC346;
}
img.hightlightImage {
	filter:alpha(opacity=50);
	opacity:.50;
}