How often is this happening? My 7 year old had daily accidents from age 3- 6. It would sometimes get better for a while and then he would start having 3-4 accidents a day. We tried medications, rewards, punishments, you name it. He would say he was too busy to get to the bathroom or he didn't even know he had wet. It was really hard to really figure out why this was happening. Finally, after talking to other moms on Mamapedia, we saw a pediatric urologist. (I would suggest this, after all it is just a short office visit and a copay). She gave us lots of helpful information but there was so much it would be hard to relay it all to you. In a nutshell, many children have this problem. Because my son had been "holding it" longer and longer in order to keep playing and avoid having to pause to use the toilet, his bladder muscles had built up to the point where it was hard for him to sense anymore that he needed to pee, and also those giganto muscles led to wetting the pants. They put him back on a schedule- he was required to use the bathroom once every hour. we had a chart next to the toilet. If he used the bathroom at least once every hour for that day, he got a prize. She said it was important to have immediate (daily) rewards for that age.
Things improved over the first few weeks of doing this. We have had a few regressions over the last year and a half where we have had to go back to the chart for a few weeks but I think we finally have the daytime trouble about kicked.