b1a = new Image (180,42);
b1a.src = "b1a.png";
b1b = new Image (180,42);
b1b.src = "b1b.png";

b2a = new Image (180,42);
b2a.src = "b2a.png";
b2b = new Image (180,42);
b2b.src = "b2b.png";

b3a = new Image (180,42);
b3a.src = "b3a.png";
b3b = new Image (180,42);
b3b.src = "b3b.png";

b4a = new Image (180,42);
b4a.src = "b4a.png";
b4b = new Image (180,42);
b4b.src = "b4b.png";

b5a = new Image (180,42);
b5a.src = "b5a.png";
b5b = new Image (180,42);
b5b.src = "b5b.png";

b6a = new Image (180,42);
b6a.src = "b6a.png";
b6b = new Image (180,42);
b6b.src = "b6b.png";


function swap (imgName,swapTo) {
	document[imgName].src = eval(swapTo+".src");
}