choose one radio box other group radion box is disabled in javascript

[NewCss]

I need choose one radio box other group radio box is disabled in java script

so far I have, but it did not work
{code}
<label for="fm-degree" class="special">
<input name="curriculum" type="radio" onclick="Show()"value="mphil" >
MPhil</label></div>

<div class="formcol" id="group7">
<label for="fm_degree" class="special">
<input name="phd_Type" type="radio" value="3-year" #if ($!ROLA_DRPC.getString('PHD_TYPE')=="3-year") checked #end/>
3-year</label></div>

{/code}
{code}
{
document.getElementById("group7").disabled=false;

}{/code}

[Padonak]

{/code}
{code}

nice try ))

[NewCss]

<label for="fm-degree" class="special">
<input name="curriculum" type="radio" onclick="Show()"value="mphil" >
MPhil</label></div>

<div class="formcol" id="group7">
<label for="fm_degree" class="special">
<input name="phd_Type" type="radio" value="3-year" #if ($!ROLA_DRPC.getString('PHD_TYPE')=="3-year") checked #end/>
3-year</label></div>


{
document.getElementById("group7").disabled=false;

}