perchè non mi funziona?

<tr>
<td width="100%" bgcolor="#FFFFFF">
<font color="#FF0000">
ACCETTA</font> <!--webbot bot="Validation"
S-Display-Name="ACCETTA" B-Value-Required="TRUE" --><input type="radio" value="V2" name="R1">
<font color="#FF0000" onClick="if(this.checked)this.form.R2.checked=fals e;">NON ACCETTA </font> <input type="radio" value="V3" name="R2" onClick="if(this.checked)this.form.R1.checked=fals e;" checked>
</td>
</tr>