How to Uncheck A radio button

I have two forms, one with a radio button that users must select to edit.

[form name="A"]
<li>[input type="radio" name="BookItem" value="1" /]</li>
<li>[input type="radio" name="BookItem" value="2" /]</li>
<li>[input type="radio" name="BookItem" value="3" /]</li>
[form]<p>

After "BookItem" is selected from form (A) I call the $("#EditFormWrapper").load("callEditData.cfm? ID="+ID); function to load the second form (B)

<div id="EditFormWrapper"><div></p>
<!---//  begin dynamic form generated by external file callEditData.cfm  //--->
[form id="editForm" name="B"]
<ul class="hourswrapper">
<li><input type="checkbox" id="TOR2Hours" class="TOR2Hours" name="TOR2Hours" value="AM2Hrs1" /> 2 Hours AM</li>
 <li><input type="checkbox" id="TOR2Hours" class="TOR2Hours" name="TOR2Hours" value="PM2Hrs1" /> 2 Hours PM</li>
<li><input type="checkbox" id="TOR2Hours" class="TOR2Hours" name="TOR2Hours" value="AM2Hrs2" /> 2 Hours AM</li>
 <li><input type="checkbox" id="TOR2Hours" class="TOR2Hours" name="TOR2Hours" value="PM2Hrs2" /> 2 Hours PM</li>
</ul>
[input type="image" src="images/submit-btn.gif" id="addBTN" name="addBTN" class="buttons" alt="SubmitRrequest" /]
[input type="image" src="images/cancel-btn.gif" id="editBTNcancel" name="editBTNcancel" class="buttons" alt="Cancel Request" /]
[/form]
<!---//  end dynamic form from external file //--->

I want to uncheck the radio button on form (A) when user click on cancel button (editBTNcancel) in form(B).

Here's my script:

$("#editBTNcancel").live("click", function(event){
    event.preventDefault();
    $("#EditFormWrapper").slideUp("fast").empty();
    //$('.TOR2Hours').removeAttr('checked');
    $('.TOR2Hours').attr('checked', false);
});

I hope I clearly state my problem, any suggestion would be greatly appreciated!

I'm not sure exactly what you want but you might try using a reset input.

<input type='reset' />