Habilitar y requerir el botón de radio en jQuery
<div id="myDiv">
<input type="radio" name="sex" value="male" disabled="disabled" /> Male<br />
</div>
<input type="radio" name="sex" value="female" /> Female
<br />
<input id="myButton" type="button" value="click here" />
$("#myButton").click(function(){
$("#myDiv").find("input").removeAttr("disabled");
})
Sleepy Scarab