a1 = new Image(); a1.src = "../images/mustangs_on.jpg";
a2 = new Image(); a2.src = "../images/ford_on.jpg";
a3 = new Image(); a3.src = "../images/chevy_on.jpg";
a4 = new Image(); a4.src = "../images/american_on.jpg";
a5 = new Image(); a5.src = "../images/foreign_on.jpg";
a6 = new Image(); a6.src = "../images/motorcycles_on.jpg";