How do I show source code in iframe

I am trying to make a little widget kind of...anyway, here is the actual widget so far:
http://userbility.net/begin.php

If you enter the detaisl it will grab the values and post them to the next page- end.php....oln end.php there is a button that says " click to get code" and I am trying to figure out how to make that iframe contain the source code for the user to copy/paste onto their site....

If you run through the steps you will see what I am talking about...how do I do this?

In the end, they will click the "click to get code" and then it will show something like this in the iframe:

My name is Sean and I am an alcoholic with 
<script>

/*
Count up from the date
*/

var montharray=new Array("Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec")

function countup(yr,m,d){
var today=new Date()
var todayy=today.getYear()
if (todayy < 1000)
todayy+=1900
var todaym=today.getMonth()
var todayd=today.getDate()
var todaystring=montharray[todaym]+" "+todayd+", "+todayy
var paststring=montharray[m-1]+" "+d+", "+yr
var difference=(Math.round((Date.parse(todaystring)-Date.parse(paststring))/(24*60*60*1000))*1)
difference+=" days"
document.write("<strong>"+difference+"</strong> sober!")
}
//enter the count up date using the format year/month/day
countup(2009,12,15)  </script>   

Code (markup):

I tried to make that whole block of code a variable and echo it and tried to just straight echo it right from the get go
but I really can't figure this out as a am VERY VERY new to PHP. I will shorten the JS once I figure out how to get this part done...so it just echos back something like:
<SCRIPT LANGUAGE="JavaScript" SRC="http://userbility.net/js/therefile1998.js">

...but for now, I just have to figure this part out....lol

 

PS: Here is a example of kind of what I mean...i think this is jquery...but maybe someone has a different way besides javascript...i duno....i just really want to know how to do this:
http://www.webuildpages.com/iframed...w.mayandoomwebsite.com'>MayanDoomsday.com</a>


He just made a string on the end of the url that fills the variables i think but...im not quite sure how to do that

 

I don't really understand the question but you don't want the script executed but show the source code instead, right?

I think you can just replace < with &lt; and > with &gt; and so on..

 

I want the code generated on end.php to show up as html/js in the frame

 

Yea I think you can do what I suggested above.

 

Thanks, worked. Just used ASCII....duno why I didnt think of that