var delay = 5;
var first = 1;
var imgi = 0;

var rimg = new Array(3);
rimg[0] = new Image();
rimg[1] = new Image();
rimg[2] = new Image();
rimg[0].src = "photos/citytruck0.jpg";
rimg[1].src = "photos/citytruck1.jpg";
rimg[2].src = "photos/citytruck2.jpg";

function rotate() {
	if (first) {
		first = 0;
	} else {
		document.images["rotate"].src = rimg[++imgi%3].src;
	}
	setTimeout("rotate()", delay*1000);
}