How do i get more RAM in my iMac G4 800?

I'd like to expand the RAM on my iMac G4 800. I read a few discussions and am not quite sure what I can do. Here is what I have and what I want to do:
Have: I have a iMac G4 800 with 512 in the J22 slot and 256 in the J20 slot. I am assuming the J20 slot is the one I can make changes to. Is that right?
Want: I'd like to add a 1 GB DRAM and make my memory 1.5 GB. I realize there is some debate about whether this machine can handle over 1 GB of main memory. So, can I do that?
Thanks

Hello and Welcome to Apple Discussions. 
I'm afraid there is no debate: 1GB is the maximum on the 800MHz iMac.
Personally I don't believe that going from 768MB to 1GB is cost effective on this older Mac given that you will have to throw out a 256MB module.
On my iMac G4 J20 is the internal "Factory" slot which is difficult to access; this notation may be different on the 800MHz model.
Some tips to improve performance:
Quit Safari often; it suffers serious memory leaks that Apple doesn't seem in a hurry to fix and will gobble up your RAM.
Keep your hard disk nice and empty. Once you fill your hard disk above the 85% level you'll start to get fragmentation and the available space for virtual memory is not there.
Use a system maintenance application like MacJanitor (link).
Quit applications when you're not using them.
Have a look in Macintosh HD > Applications > Utilities > Activity Monitor. How much Free and Inactive RAM do you have? If the processor regularly being tasked to 100%? How many Page Outs do you have?
cheers
mrtotes

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