How to add code to an au3 page on the fly..

I have built a Gui that downloads a page with a table in it and I want to add a radio box next to each item when it displays.
Is there an easy way to do this..
Is this the best way or can it be done on the fly.. right now I wait for it to load then rewrite it ... is there a simpler or easier way?

Once the GUI is loaded with the page...

Local $sHTML = _IEBodyReadHTML($oIE)

$sHTML = $sHTML & "<p><font color=red size=+5>Big RED text!</font>"

_IEBodyWriteHTML($oIE, $sHTML)

This adds to the end of it and I assume I could do  a search and replace something in the table to get radio boxes at the end of each <td> maybe with something line
find </tr> replace with <td>radio box</td></tr>

any suggestions.. I am probably doing it the hard way.... Thanks...