imageOn = new Array(10)
imageOff = new Array(10)

for(i=1;i<11;i++)
{
    imageOn[i] = new Image()
    imageOff[i] = new Image()

}

imageOn[1].src = "img/trav_on.jpg"
imageOn[2].src = "img/art_on.jpg"                               
imageOn[3].src = "img/gour_on.jpg"
imageOn[4].src = "img/plea_on.jpg"
imageOn[5].src = "img/heal_on.jpg"
imageOn[6].src = "img/busi_on.jpg"
imageOn[7].src = "img/wand_on.jpg"
imageOn[8].src = "img/sear_on.jpg"

imageOff[1].src = "img/trav.jpg"
imageOff[2].src = "img/art.jpg"                               
imageOff[3].src = "img/gour.jpg"
imageOff[4].src = "img/plea.jpg"
imageOff[5].src = "img/heal.jpg"
imageOff[6].src = "img/busi.jpg"
imageOff[7].src = "img/wand.jpg"
imageOff[8].src = "img/sear.jpg"

function display_on(num,ctr)
{
document.images[ctr].src = eval("imageOn["+num+"].src")
}

function display_off(num,ctr)
{
document.images[ctr].src = eval("imageOff["+num+"].src")
}