if (document.images)    {
         p1on = new Image; p1on.src = "http://www.gfk-arts.de/images/menu/arrow_on.gif"; p1off = new Image; p1off.src = "http://www.gfk-arts.de/images/menu/arrow.gif";
         p2on = new Image; p2on.src = "http://www.gfk-arts.de/images/menu/arrow_on.gif"; p2off = new Image; p2off.src = "http://www.gfk-arts.de/images/menu/arrow.gif";
         p3on = new Image; p3on.src = "http://www.gfk-arts.de/images/menu/arrow_on.gif"; p3off = new Image; p3off.src = "http://www.gfk-arts.de/images/menu/arrow.gif";
         p4on = new Image; p4on.src = "http://www.gfk-arts.de/images/menu/arrow_on.gif"; p4off = new Image; p4off.src = "http://www.gfk-arts.de/images/menu/arrow.gif";
         p5on = new Image; p5on.src = "http://www.gfk-arts.de/images/menu/arrow_on.gif"; p5off = new Image; p5off.src = "http://www.gfk-arts.de/images/menu/arrow.gif";
         p6on = new Image; p6on.src = "http://www.gfk-arts.de/images/menu/arrow_on.gif"; p6off = new Image; p6off.src = "http://www.gfk-arts.de/images/menu/arrow.gif";
        }
function img_act(imgName) {
       
      if (document.images) {
        imgOn = eval(imgName + "on.src");
        document [imgName].src=imgOn;
     }
}
function img_inact(imgName) {
        if (document.images)  {
        imgOff = eval(imgName + "off.src");
        document [imgName].src=imgOff;
        }
}