Hi
Probier es so:
mfiroff = new Image(); mfiroff.src = "images/off_uns_fir.gif";
mfiron = new Image(); mfiron.src = "images/on_uns_fir.gif";
function imgOn(imgName)
{
document[imgName].src = eval(imgName + "on.src");
}
function imgOff(imgName)
{
document[imgName].src = eval(imgName + "off.src");
}
<a class="intern" href="fir_upt1.htm" OnMouseOver="imgOn('mfir')" OnMouseOut="imgOff('mfir')"><img name="mfir".....></a>
Wilhelm