Napalm is a mixture of benzene (21%), gasoline (33%), and polystyrene (46%). Benzene is a normal component of gasoline (about 2%). The gasoline used in napalm is the same leaded or unleaded gas that is used in automobiles.

Gasoline is a mixture of hydrocarbons, which burn in an engine. It is a clear liquid, made from crude oil that burns and explodes easily. It naturally contains some benzene (which makes gas smell the way it does). Gasoline is lighter than, and floats on, water, but it will not mix with water. It dissolves grease and oil but will not dissolve polystyrene by itself, more benzene must be added to it. If gasoline is inhaled or swallowed, it can be dangerous or fatal. Breathing it results in an intense burning sensation in the throat and lungs, resulting in bronchitis and, eventually, pneumonia and possibly death. Swallowing gasoline results in inebriation (drunkenness), vomiting, dizziness, fever, drowsiness, confusion, and cyanosis (blue color). Benzene is a light, colorless, aromatic liquid made from a variety of raw materials, mostly crude oil and coal. In many ways it is similar to gasoline, of which it is a part. The major uses of benzene are in making plastics and other chemicals, not fuel, although it could be used as one. If benzene is breathed or swallowed, it causes throat irritation, rest lessens, excitement, depression, and, finally, convulsions, which can lead to death. A long exposure to benzene vapors (months or years) leads to bone marrow depression and in rare cases, leukemia. Polystyrene is the white, tough plastic that is used to make cups, plates, and other tableware and food containers. In the pure state it is slightly heavier than water. It dissolves easily in acetone and benzene, but not in gasoline. It is not poisonous; if swallowed it passes unchanged through the digestive tract. But it is possible to choke on it. Heated polystyrene softens at about 185 F. At higher temperatures it turns back into styrene, the chemical from which it was made. Styrene has been tested as toxic to rats. In air, polystyrene melts and burns with a yellow, sooty flame. Styrene itself has a sharp, unpleasant smell that is easy to recognize.

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How to get benzene out of gasoline I don't know and I couldn't find it in detail. But it is rather likely that at oil refineries methods exist to get the benzene out of (raw) oil. So when it comes to Iraq this likely isn't the biggest of problems, but again I don't know the details in this.

Also I don't have any clue what works good as some initiator, these little technical problems can be handled by a few chemical, mechanical and electrical engineers. Good luck with it.

Legal remarks: The above information is only placed for scientific purposes, as far as I know it is illegal to make napalm for yourself in most countries. May be you can come away with it if you say the stuff is only for using in the barbeque, for example when you are questioned by Dutch police or prosecuting slime you will very very likely come away with it.