my question is ,is it ok to train an opposing muscle groups while being sore from one day to the next?

if you are asking if you can train your bicep while your tricep is sore from the day before then yes.

I see! ....the reason I'm asking is because the Nerveous System is already stress, and I'm thinking it might blunt recovering even more and bump the cortisol levels and maybe be catabolic?

If you want to off-set that soreness some, trying soaking in a really hot bath of epsom salt. Also, you could drink a couple of glasses of spring water with 3-4 fresh squeezed lemons in it. You are stressing the nervous system, but with two different actions.

Here's a lil somethin-somethin I read about today:
"Fight Pain with Cherries?

According to research submitted to the 2009 annual meeting of the American College of Sports Medicine (abstracts 851 and 852), consuming tart cherry juice can reduce pain from exercise. Healthy runners between the ages of 18 and 50 were randomly selected to receive either tart cherry juice or a placebo to drink one week before the race. The group with the cherry reported less pain. Another study had 14 women with fibromyalgia drinking either tart cherry juice or a placebo for 10 days to see its effect on muscle pain and strength after exercise. Once again, the group receiving the cherry juice had less pain and more strength.

It makes sense, according to an article appearing in the Journal of Natural Products (1999;62(2):294- 296), substances in tart cherries, called anthocyanins and cyanidin are both antioxidant and antiinflammatory. Another article in the Clinical Journal of Pain (January/February 2004;20(1):19- 26) mentions that substances in tart cherry juice are anti inflammatory."

Have you considered a brisk 10 min walk after the workout and a good stretch, massaging the muscles you just worked as you stretch them?

One other good anti-inflammatory is turmeric. Use it in your food, no cals and is really good for your all-around health. It really has no outstanding taste and can be used as a base for other types of spices.

Tumeric, Boswelia, Rosemary, and Ginger are all good spices/seasoning that reduce inflammation