refering radio buttons from javascript

Dear all
i have the folowing Html code
<td align="right" valign="top">
<font class="medium_font">
AAA
</font>

<input class="medium_font" type="radio" name="abc" value="def" tabindex="32">
<br>

<font class="medium_font">
BBB
</font>

<input class="medium_font" type="radio" name="abc" value="ghi">
</td>

i want to write Script in java to access this radio type and enable one of them as true as an if condition is true
How do i do that???


thanks alot

Give the radio an unique ID (id="MyId") and refer to it from javascript by using the
GetElementById("MyId") function.