post javascript variable as form input to php

Hi,
I am trying to post a javascript variable as form input to a php file.

I have a radio button and if the user selects the radio button and submits the form,the javascript variable should be posted to the php file.However,it is not working.This is what I am trying to do.What's the correct method?Thanks
Note:questions[4][1] is the javascript variable here.

<input type="radio" name="q5"><script>document.write(questions[4][1]);</script><br>

 

Assuming myVariable is global:

<input type="radio" name="q5" onclick='this.value=myVariable'>

Code (markup):

There should be more than one button in the group, otherwise the action cannot be undone.
Perhaps:

<input type="radio" name="q5" onclick='q5[1].value=null'>Undo<br>
<input type="radio" name="q5" onclick='this.value=myVariable'>Set

Code (markup):

 

yeah,
there will be more than one radio button.This is how the form looks like

<form name="QuestionAnswers" action="30" method= "post">
   
<input type="submit" name="Submit_answers" value="Submit Answers" >



    
<script>document.write(questions[0][0]);</script><br> <!-- This is the question -->


 <!-- The following are the answer choices  -->

 <input type="radio" name="q1"><script>document.write(questions[0][1]);</script><br>

 <input type="radio" name="q1"><script>document.write(questions[0][2]);</script><br>
 
 </form>
  

Code (markup):

 

Hi
Your method worked.Thanks a lot.Here's my new code(please note that I have not published certain parts of the code before/after and in between the present code as I thought it was irrelevant to the discussion.)

<form name="QuestionAnswers" action="30" method= "post">



<input type="submit" name="Submit_answers" value="Submit Answers" >


 <!--This is the question-->
<script>document.write(questions[0][0]);</script><br>

<!--These are the answer choices-->
 <input type="radio" name="q1" onclick='this.value=questions[0][1]'><script>document.write(questions[0][1]);</script><br>

 <input type="radio" name="q1"  onclick='this.value=questions[0][2]'><script>document.write(questions[0][2]);</script><br>


</form>

Code (markup):

 

you can try to add it to a url and get it as a GET with the server page