intermittent overheat

I was driving down the high way this morning and my check gauges light came on. My temperature gauge was almost to the max. When I slowed the car down, the gauge went down as well. I am curious to know what the problem could be. I have had the head gaskets replaced within the last couple of years and the radiator completley flushed about a month ago. I have a 97 chevy cavalier.

Any help would be greatly appreciated.
Thank you.

Try your collant temp sensor first. When the guages went up and down was the motor hot??

I didnt get a chance because I had to rush into work, I will let you know on the drive home ( I am fixing to leave) Thank you.

im a bonehead... i had my radiator flushed and didnt take it back to have them check the coolant and my coolant was low.....

that'll do it