everyone says your diet should be differnet on training days and non training days, but what should be different? more carbs on training days? more protein on the day after training?

Your training days should contain a pre, post, and post-post workout meal containing pro/carbs.

EDIT*
pre = solid food
post = whey/dextrose shake
post-post = solid pro/carb meal

oh yh i always do that. thanks

In addition, some people cut back a little bit on non training days. For me, I don't have a post workout shake on non training days, so thats hundreds of calories right there.

Like some of the other posts - I have a carb/protein drink during and after a weight training session and i also have a heavy carb meal of starchy carbs one hour after my training. I don't usually eat starchy carbs on off days but if i do it will only be at breakfest.