It seems that your computer was built too long ago to support CITRIX in Safari.
BUT! All hope is not lost. You can run Windows in a virtual environment within your computer. You will need two things:
Virtualization software allows you to run Windows inside your Macintosh operating system. There are three main options and they fit into two different categories. The software options are:
The two categories are:
Boot Camp is free (but requires a re-start to get into and out of Windows). Parllels and Fusion cost $60-$80.
It does not matter which version of Windows you buy. I used a copy of Windows XP from an old Dell I got rid of long ago. For most users, buying a Windows license brand new can be a significant cost.
Once you have a virtual desktop in place with Windows, follow the instructions provided by IMD (located on the J:/ drive in the CITRIX folder).
That's it!
Good luck with everything. Let me know if you have any problems.
Jacob