//creates variable that will increment through the images

var step=1
function slideit(){
//if browser does not support the image object, exit.
if (!document.images)
return
document.images.show.src=eval("show"+step+".src")
if (step<4)
step++
else
step=1
//call function "slideit()" every 3.5 seconds
setTimeout("slideit()",3500)
}
slideit()