If its only going to be for this one page try using an internal CSS stylesheet with the following:
CSS
#tdleft {
width: 100px;
height: 100px;
background-color: green;
border-radius: 10px 0px 0px 0px;
-moz-border-radius: 10px 0px 0px 0px;
-webkit-border-top-right-radius: 0px;
-webkit-border-bottom-right-radius: 0px;
-webkit-border-bottom-left-radius: 0px;
}
#tdright {
width: 100px;
height: 100px;
background-color: green;
border-radius: 0px 10px 0px 0px;
-moz-border-radius: 0px 10px 0px 0px;
-webkit-border-top-right-radius: 10px;
}
This would be your code:
<table>
<td id="tdleft"></td>
<td id="tdright"></td>
(Probably not the best way to get it done but it should get it done.)
FWD