var num=1
img1 = new Image ()
img1.src = "porkupine_01.jpg"
img2 = new Image ()
img2.src = "porkupine_02.jpg"
img3 = new Image ()
img3.src = "porkupine_03.jpg"
img4 = new Image ()
img4.src = "porkupine_04.jpg"
img5 = new Image ()
img5.src = "porkupine_05.jpg"


function slideshowUp()
{
num=num+1
if (num==6)
{num=1}
document.porkupine.src=eval("img"+num+".src")
}

function slideshowBack()
{
num=num-1
if (num==0)
{num=5}
document.porkupine.src=eval("img"+num+".src")
}