Basically ... you downloaded the script for suspend2. Without recompiling your kernel to support suspend2 that script is useless.
www.suspend2.net --- suspend2 patches and how-to
www.kernel.org --- vanilla kernel download
http://www.ubuntuforums.org/showthread.php?t=43065 --- nice how to on compiling a kernel in Ubuntu.
Kernel recompiles aren't that rough, but I really wish they would just get this into the mainstream kernel! Anyway, if the suspend/hibernate built into Ubuntu isn't working for you, this is your only option.