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

Array.prototype.enqueue = function(vItem) {
    this.push(vItem); }; Array.prototype.dequeue = function() {
    return this.shift(); }; Array.prototype.indexOf = function (vItem) {
    for (var i=0; i

Array.indexOf = (Array.prototype.indexOf) ?         function(a, val) {
              return Array.prototype.indexOf.call(a, val);         } :         function(a, val) {
              for (var i=0; i

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