if (document.images) { 

img1on = new Image();
img1on.src = "../../i/pfeil2.gif";
img1off = new Image();
img1off.src = "../../i/pfeil1.gif";
img2on = new Image();
img2on.src = "../../i/pfeil6.gif";
img2off = new Image();
img2off.src = "../../i/pfeil5.gif";

}

function imgOff(imgName) {
    if (document.images) {
      document[imgName].src = eval(imgName + "off.src");
    }
}

function imgOn(imgName) {
    if (document.images) {
      document[imgName].src = eval(imgName + "on.src");
    }
}