function lightup(self, imgName)
{
if (document.images)
{
imgOn = eval(imgName + "on.src");
self.src = imgOn;
}
}

function turnoff(self, imgName)
{
if (document.images)
{
imgOff = eval(imgName + "off.src");
self.src= imgOff;
}
}

function clickdown(self, imgName)
{
if (document.images)
{
imgDown=eval(imgName + "down.src");
self.src = imgDown;
}
}