disable textbox using jquery?

Question

I have three radio buttons with same name and different values.When I click the third radio button the checkbox and textbox going to be disabled.but when I choose other two radio buttons it must be show.I need the help in Jquery.Thanks in advance....

<form name="checkuserradio">     <input type="radio" value="1" name="userradiobtn" id="userradiobtn"/>      <input type="radio" value="2" name="userradiobtn" id="userradiobtn"/>     <input type="radio" value="3" name="userradiobtn" id="userradiobtn"/>     <input type="checkbox" value="4" name="chkbox" />     <input type="text" name="usertxtbox" id="usertxtbox" /> </form> 

Answer 1

HTML

<span id="radiobutt">   <input type="radio" name="rad1" value="1" />   <input type="radio" name="rad1" value="2" />   <input type="radio" name="rad1" value="3" /> </span> <div>   <input type="text" id="textbox1" />   <input type="checkbox" id="checkbox1" /> </div> 

Javascript

  $("#radiobutt input[type=radio]").each(function(i){     $(this).click(function () {         if(i==2) { //3rd radiobutton             $("#textbox1").attr("disabled", "disabled");              $("#checkbox1").attr("disabled", "disabled");          }         else {             $("#textbox1").removeAttr("disabled");              $("#checkbox1").removeAttr("disabled");          }       });    });