image1 = new Image();
image1.src = "images/b1.gif";

image2 = new Image()
image2.src = "images/a1.gif"

image3 = new Image()
image3.src = "images/b2.gif"

image4 = new Image()
image4.src = "images/a2.gif"

image5 = new Image()
image5.src = "images/b3.gif"

image6 = new Image()
image6.src = "images/a3.gif"

image7 = new Image()
image7.src = "images/b4.gif"

image8 = new Image()
image8.src = "images/a4.gif"

var step=1

function slideit(){
	document.images.slide.src=eval("image"+step+".src");
	if (step<8) step++;
	else step=1;
	setTimeout("slideit()",2500);
}