function up_jpg(imgName) {
if (document.images) 
document.images[imgName].src = eval(imgName + ".src") + "-g.jpg";
}
function over_jpg(imgName) {
if (document.images)
document.images[imgName].src = eval(imgName + ".src") + "-c.jpg";
}
function up_gif(imgName) {
if (document.images) 
document.images[imgName].src = eval(imgName + ".src") + "-g.gif";
}
function over_gif(imgName) {
if (document.images)
document.images[imgName].src = eval(imgName + ".src") + "-c.gif";
}

function over(imgName) {
   document.images[imgName].src = eval(imgName + "_over.src");
}
function up(imgName) {
   document.images[imgName].src = eval(imgName + "_up.src");
}
function setimg(imgName, imgSrc) {
   document.images[imgName].src = eval(imgSrc + ".src");
}