To display a message in flaming all caps, you need to invoke my script and then write a one-line script of your own.
First, my script:
This script defines the flamers function, which you will invoke in your own script to create your flaming text.
Your one-line script is
where size is a number designating the desired size (the height in pixels) and text is the text you want displayed. Of course your script goes inside another <script> tag. Also, the GIF files that make up the lettering don't have much breathing room, so it's best to put them on a black background. One way to do that is to put the script inside a table. You can also add horizontal spacing by including spaces at the beginning and end of the text.
For example, here is the script that produced the flaming text at the top of this page: