imageName = new Array()
imageName[0] = "images/topnav01a.gif"
imageName[1] = "images/topnav01b.gif"
imageName[2] = "images/topnav02a.gif"
imageName[3] = "images/topnav02b.gif"
imageName[4] = "images/topnav03a.gif"
imageName[5] = "images/topnav03b.gif"
imageName[6] = "images/topnav04a.gif"
imageName[7] = "images/topnav04b.gif"
imageName[8] = "images/topnav05a.gif"
imageName[9] = "images/topnav05b.gif"
imageName[10] = "images/topnav06a.gif"
imageName[11] = "images/topnav06b.gif"
imageName[12] = "images/topnav07a.gif"
imageName[13] = "images/topnav07b.gif"
imageName[14] = "images/topnav08a.gif"
imageName[15] = "images/topnav08b.gif"
imageName[16] = "images/topnav09a.gif"
imageName[17] = "images/topnav09b.gif"
imageName[18] = "images/topnav10a.gif"
imageName[19] = "images/topnav10b.gif"

function swapOut(num,imgname){
     imgname.src = im[num].src
}
im = new Array()
for (var i = 0; i < imageName.length; i++){
       im[i] = new Image()
       im[i].src = imageName[i]
}