var step=1
var image1=new Image()
var image2=new Image()
var image3=new Image()
var image4=new Image()
var image5=new Image()
var image6=new Image()
var image7=new Image()

function slide_start(katalog) {
    image1.src="images/01_sm.jpg"
    image2.src="images/02_sm.jpg"
    image3.src="images/03_sm.jpg"
    image4.src="images/04_sm.jpg"
    image5.src="images/05_sm.jpg"
    image6.src="images/06_sm.jpg"
    image7.src="images/07_sm.jpg"

    step=1
    slide()
}

function slide(){
//if browser does not support the image object, exit.
if (!document.images)
return
document.images.slide.src = eval("image"+step+".src")
if (step<7)
step++
else
step=1
//call function "slideit()" every 2.5 seconds
setTimeout("slide()",1500)
}