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This relies on the gd extension which should be available with php 4.3 upwards but no always enabled, run phpinfo() to see your settings or check the php.ini (look for extension extension=php_gd2.dll - or similar) file if you have access to it, which ever is easiest.
Altho pay heavy attention to the line which reads:
Watch the CPU load
You need to be aware of one important consideration when you create these graphics server-side: They're CPU intensive. If you place too many of these dynamic images on your Web site, you may find that you will incur a performance hit.
Think ill try put the above page to some use.
[edited by: PSWorx at 10:21 pm (utc) on Mar. 14, 2007]