function Car(sColor, iDoors, iMpg){
	this.color = sColor;
	this.door = iDoors;
	this.mpg = iMpg;
	this.drivers = new Array('Mike', 'Sue');
 
	if(typeof Car._initialized === 'undefined'){
		Car.prototype.showColor = function(){
			alert(this.color);
		};
		Car._initialized = true;
	}
}