[Image_Graph]

I'm trying to use the Image_Graph package to create some simple bar charts. I've found an example published on http://pear.veggerby.dk/docs/ however when I try and use his example, it comes up with the following error: Fatal error: Call to undefined method Image_Graph::verticallayoutfactory() in C:\www\localhost\syslog\test.php on line 21 Does anyone know what causes this? Also, does anyone have a simple doc that covers using Image-Graph? Cheers Nunners