This is relatively simple to do by using jQuery on top of the existing script. To do so, first, add a reference to the jQuery libary in the HEAD section of your page (in red):
Code:
<script type="text/javascript" src="http://www.google.com/jsapi?key=YOUR-API-KEY"></script>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
<script type="text/javascript" src="gfeedfetcher.js"></script>
<script type="text/javascript" src="gajaxticker.js">
/***********************************************
* gAjax RSS Ticker- (c) Dynamic Drive (www.dynamicdrive.com)
* Requires "gfeedfetcher.js" class
* This notice MUST stay intact for legal use
* Visit http://www.dynamicdrive.com/ for full source code
***********************************************/
</script>
Then, use the modified .js file below. The value 400 as it appears inside this file dictates the duration of the fade in mililsecs- you can change that to something else if desired.
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