In the source, you will find the following code. Take notice of the flashvars in bold:

<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=9,0,28,0" width="500" height="330" title="slider">
<param name="movie" value="slider.swf" />
<param name="quality" value="high" />
<param name="flashvars" value="folder=photos/&photos=Buffalo.jpg,Reindeer.jpg,Gazelle.jpg,Elephant.jpg,Zebra.jpg" />
<embed src="slider.swf" width="500" height="330" quality="high" pluginspage="http://www.adobe.com/shockwave/download/download.cgi?P1_Prod_Version=ShockwaveFlash" type="application/x-shockwave-flash" flashvars="folder=photos/&photos=Buffalo.jpg,Reindeer.jpg,Gazelle.jpg,Elephant.jpg,Zebra.jpg"></embed>
</object>