To include this FX in your document you need to put the the following in the HEAD section of your document

<!-- *** BEGIN CUT - Start Code *** -->
<!-- (* Another free JavaScript from JavaScript-FX.com *) -->
<SCRIPT LANGUAGE="javascript" SRC="javascript/JSFX_Layer.js"></SCRIPT>
<SCRIPT LANGUAGE="javascript" SRC="javascript/JSFX_Mouse.js"></SCRIPT>
<SCRIPT LANGUAGE="javascript" SRC="javascript/JSFX_Fire.js"></SCRIPT>
<SCRIPT LANGUAGE="javascript" TYPE="text/javascript">
<!--
function JSFX_StartEffects()
{
      JSFX.Fire(40, 0);
}
//-->
</SCRIPT>
<!-- *** END CUT - End Code *** -->

Put the following in the BODY TAG of your document

<BODY onLoad="JSFX_StartEffects()">

Customization.
Param1: 40 - The number of elements in the fire effect.
Param2: 0 - The effect to create, e.g.

JSFX.Fire(40, 0); //Rocket Cursor
JSFX.Fire(40, 1); //Comet Cursor
JSFX.Fire(40, 2); //Sparkler Cursor
JSFX.Fire(40, 3); //Flaming Torch Cursor

Also See...
Using External ".js" Files
Combining Multiple Scripts.