Radiator problems in Honda?

The past week my 2002 honda accord has been losing water out of the radiator and reservoir. When I'm in heavy traffic the temp hand goes up but once I start driving it goes down. I could fill my radiator with water and drive 10 miles and it would be empty again. Well yesterday I filled it and have driven about 100 miles during the day and it's still full and temp hand didn't go up at all. What would cause this and then cause it to stop?

Could be, here is the forum that help me man, good luck

http://www.carproblemzoo.com/honda/accord/2002/radiator-problems.php