Shoutbox

Hi all,
Long ago I posted a question, and in general I have been told it can be done using plugins.
I read in the scripting documentation that there is no longer a support for plugins, so I don't know....
Here is the thing:
I want the sender itself to be able to click on a word he sent, just like a link.
Nothing dangerous here, because the sender itself clicked on the link, and not the receiver of the message.
How do I approach this? At first I thought I can write something like this:
A HREF="javascript:clickedText()">clickedWord</A>

function clickedText() {
   //do something
}

but then I understood there is no support for this in messenger plus.

Thanks guys.