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I second sped's advice. Overheating at idle in traffic is an air flow problem. Usual cause on your model...clogged radiator, or front fan not coming on. If you have the original radiator, and/or if you live where there is much lime in the water, the radiator will calcify and clog (I've found many individuals don't use a distilled water/coolant mixture). Further, the front of the radiator can get blocked with every bug, and every debris known to man as you zip down the road. Make certain your engine cooling fan works on BOTH speeds properly. Sitting in traffic, with the AC on, the fan should be on the higher speed.
A headgasket can be diagnosed rather easily. You either have water in the oil, or compression in the cooling system. If you take the exp tank cap off, and then start the car, do you have bubbles in the tank? Do you have what looks like chocolate milk on the dipstick? After a long drive, does your expansion tank look swollen? Does your car run rough or skip, particularly at first start? If you answered "no" to these questions, a headgasket is as unlikely as my children NOT asking me for money.
Hope this helps.
Chris
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